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Old 03-27-2010, 08:26 PM   #1
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Calling Shorty Header Owners

I think there are a lot of people like myself who are interested in adding Shorty headers but are skeptical of some of the claims of 25+ HP gains by manufacturers.

Many of us are looking to add some mods that will not void our warranties, due to having to get a tune, or cause us issues with emissions and I think it would be a huge help to a lot of people if you could post what type of shorty headers you put on and what numbers you got by adding them.

Thanks!
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Old 03-27-2010, 08:33 PM   #2
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i thought shorties did void your warranty
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Old 03-27-2010, 08:40 PM   #3
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i thought shorties did void your warranty
I asked my local dealer about this. They said aslong as you leave your cats there the warranty is still good.
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Old 03-27-2010, 08:48 PM   #4
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Shorties in theory wont void your warranty because they are direct replacement for your stock headers and bolt up accordingly HOWEVER if GM felt like saying the headers caused whatever happened to break on your truck and attempted to give proof as to why, they may deny warranty but this would be pretty unlikely IMO.

And x2 am curious to see because Doug Thorley is reporting close to 22+ HP and 35+ TQ with theirs and JBA I believe said 18+ HP with their set. Post some dyno pulls if yah gott'm.
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Old 03-28-2010, 12:14 AM   #5
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Old 03-28-2010, 12:32 AM   #6
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Old 03-28-2010, 12:50 AM   #7
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I would personally go with the Doug Thorley set. Unless it can be proven that the mod caused the part to break, should have no issues with warranty. Any dealer who states differently is wrong. If you encounter one go to another dealer.
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Old 03-28-2010, 01:12 AM   #8
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If you're going with shorties because of smog, make sure you get exemption numbers, otherwise it's a waste. Go LTs if you can.
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Old 03-28-2010, 01:44 AM   #9
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If you're going with shorties because of smog, make sure you get exemption numbers, otherwise it's a waste. Go LTs if you can.
long as the cats are in place i would think it wouldn't matter.
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Old 03-28-2010, 08:17 AM   #10
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Im not too worried about emissions, I am more worried about voiding my warranty due to tuning the car. If it wasnt for that I would get LTs and a tune tomorrow.

I just dont wanna waste money on shorty headers if I am not going to get more then a 5 HP gain. With LTs, CAI and a tune seems like people are getting 40-60 HP. I am wondering if I can get 20-30 with a CAI and shorty headers?
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Old 03-28-2010, 10:33 AM   #11
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Im not too worried about emissions, I am more worried about voiding my warranty due to tuning the car. If it wasnt for that I would get LTs and a tune tomorrow.

I just dont wanna waste money on shorty headers if I am not going to get more then a 5 HP gain. With LTs, CAI and a tune seems like people are getting 40-60 HP. I am wondering if I can get 20-30 with a CAI and shorty headers?
As I posted earlier, Doug Thorley and JBA are both posting close to +20 RWHP gains and around +30-35 RWTQ. They have dyno sheets on their websites.
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Old 03-28-2010, 10:36 AM   #12
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As I posted earlier, Doug Thorley and JBA are both posting close to +20 RWHP gains and around +30-35 RWTQ. They have dyno sheets on their websites.
I saw those, as I posted originally I was just hoping for some independent results as apposed to those posted by the people trying to sell the product.

I have read a bunch of posts with varying opinions on the performance of shorty headers but I have yet to find any one who has actually posted before and after dyno numbers.
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Old 03-28-2010, 10:59 AM   #13
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I saw those, as I posted originally I was just hoping for some independent results as apposed to those posted by the people trying to sell the product.

I have read a bunch of posts with varying opinions on the performance of shorty headers but I have yet to find any one who has actually posted before and after dyno numbers.
Understood and I agree that I've yet to hear from anyone as well who had done shorties...at least on the V8 model
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Old 03-28-2010, 11:28 AM   #14
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I have DT shorties but never got it dyno'd, don't really care to at this point. I can tell you that there was a noticable difference in low/mid range torque just by seat of pants feel! On top of that I think they really look great! Open the hood and people can see you have headers, I get good comments from everyone! I too was only worried about warranty and not emissions. You'll probably pay mid $500's for shorties and only a little more for lower end long tubes but the question remains....to tune or not to tune!
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Old 03-28-2010, 07:07 PM   #15
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I have DT shorties but never got it dyno'd, don't really care to at this point. I can tell you that there was a noticable difference in low/mid range torque just by seat of pants feel! On top of that I think they really look great! Open the hood and people can see you have headers, I get good comments from everyone! I too was only worried about warranty and not emissions. You'll probably pay mid $500's for shorties and only a little more for lower end long tubes but the question remains....to tune or not to tune!
Thanks ssmike that is good feed back. Low/mid range torque is really what I am most interested in anyway. I think I will go for it, a little extra low/mid range torque, better sound and looks makes it worth it for $500. I really dont wanna tune and toss away a 5 year warranty.
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Old 03-28-2010, 07:17 PM   #16
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I think it is possible to get maybe 15 hp out of shorties, but you need a CAI and a cat back system too. You can't just open up one piece of the chain. I would think about 20-30 hp with aftermarket CAI + shorties + cat back system. The hp gain is just part of it. The sound improvement makes it worth it too!
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Old 03-28-2010, 11:41 PM   #17
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I think it is possible to get maybe 15 hp out of shorties, but you need a CAI and a cat back system too. You can't just open up one piece of the chain. I would think about 20-30 hp with aftermarket CAI + shorties + cat back system. The hp gain is just part of it. The sound improvement makes it worth it too!
What he said, but not as much as 30 if you keep all variables the same. I installed DT shorties, Hennessey CAI, and Borla S-type cat-back. Prior to install, filled it up with 93 octane (we only have 91 readily available out here), did baseline pulls, got about 360 RWHP corrected. It was eddy-current type dyno, not DynoJet, hence the lower numbers. Installed shorties, CAI, cat-back and drove for about 300 miles on 93 octane, did battery pull, and re-dyno'd. Got 378 RWHP. Did 4 pulls, all were within 2-3 HP, 378 was the average.

In talking with several builders and doing lots of reading, seems you can realistically expect 8-10 HP with shorties, 5-8 HP with CAI, and 0-4 HP with cat-back (if that, usually nothing). You can also gain 10-12 with just a tune and changing no bolt-ons. My thoughts are that the 18-22 that manufacturers claim with shorties are about an equal split between the shorties themselves and a tune. They just don't tell you about the tune. Or, and I've seen this before, they mess with correction factors, smoothing, etc. and you can always sway things quite a bit that way.

Long story short, I've talked to a lot of people about this since I was greatly curious when buying my shorties back 7 months ago, but there is no way you're getting 18+ RWHP with just shorties and nothing else. With CAI, possibly. With tune, possible. With both, yeah, but probably no more than 22 or so total. You can't just add all the numbers. Doesn't work that way.
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Old 03-28-2010, 11:48 PM   #18
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What he said, but not as much as 30 if you keep all variables the same. I installed DT shorties, Hennessey CAI, and Borla S-type cat-back. Prior to install, filled it up with 93 octane (we only have 91 readily available out here), did baseline pulls, got about 360 RWHP corrected. It was eddy-current type dyno, not DynoJet, hence the lower numbers. Installed shorties, CAI, cat-back and drove for about 300 miles on 93 octane, did battery pull, and re-dyno'd. Got 378 RWHP. Did 4 pulls, all were within 2-3 HP, 378 was the average.

In talking with several builders and doing lots of reading, seems you can realistically expect 8-10 HP with shorties, 5-8 HP with CAI, and 0-4 HP with cat-back (if that, usually nothing). You can also gain 10-12 with just a tune and changing no bolt-ons. My thoughts are that the 18-22 that manufacturers claim with shorties are about an equal split between the shorties themselves and a tune. They just don't tell you about the tune. Or, and I've seen this before, they mess with correction factors, smoothing, etc. and you can always sway things quite a bit that way.

Long story short, I've talked to a lot of people about this since I was greatly curious when buying my shorties back 7 months ago, but there is no way you're getting 18+ RWHP with just shorties and nothing else. With CAI, possibly. With tune, possible. With both, yeah, but probably no more than 22 or so total. You can't just add all the numbers. Doesn't work that way.
At least we can get some real world feedback now. So money wise...shorties...worth the pennys or save your money for something else??
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Old 03-29-2010, 12:07 AM   #19
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At least we can get some real world feedback now. So money wise...shorties...worth the pennys or save your money for something else??
IMO it depends on what you want to do. The DT shorties are beautiful for show and they do give a bit of power, just not what they claim. Notice nobody except Borla stepped up to Ted's open call for shorty shoot-out. As good as that was of Borla, their claims on their cat-back are outlandish. I've seen no better than 3-4 RWHP with any of the 2.5" cat-back tests on here and the builders I've talked to have confirmed the same. Borla said something like 20 with the 140280 that I have.

For show, DT shorties are best bang for buck. They are ceramic coated and really look great. For performance, go with good longtubes and HF cats. ARH has proven great performance for longtubes. If staying naturally aspirated - longtubes/HF cats, CAI, cam, and tune give best bang for the buck. Porting heads, bigger throttle bodies, stroking, etc. if you're going crazy. If going supercharged, be wary of freeing up exhaust too much or you blow out the boost and have to drop pulley sizes and at some point get belt slippage.

So just depends. Show - DT shorties. Performance - longtubes/HF cats if NA, either stock/shorties with high boost or longtubes/HF cats with lower boost if SC.
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Old 03-29-2010, 12:13 AM   #20
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IMO it depends on what you want to do. The DT shorties are beautiful for show and they do give a bit of power, just not what they claim. Notice nobody except Borla stepped up to Ted's open call for shorty shoot-out. As good as that was of Borla, their claims on their cat-back are outlandish. I've seen no better than 3-4 RWHP with any of the 2.5" cat-back tests on here and the builders I've talked to have confirmed the same. Borla said something like 20 with the 140280 that I have.

For show, DT shorties are best bang for buck. They are ceramic coated and really look great. For performance, go with good longtubes and HF cats. ARH has proven great performance for longtubes. If staying naturally aspirated - longtubes/HF cats, CAI, cam, and tune give best bang for the buck. Porting heads, bigger throttle bodies, stroking, etc. if you're going crazy. If going supercharged, be wary of freeing up exhaust too much or you blow out the boost and have to drop pulley sizes and at some point get belt slippage.

So just depends. Show - DT shorties. Performance - longtubes/HF cats if NA, either stock/shorties with high boost or longtubes/HF cats with lower boost if SC.
I think that info pretty much closes it. I believe he wanted some power gains and even I was under the impression given the dyno sheets that shorties actually did step up on these Gen 5's to at least 15+ HP but this proves it wrong! I don't know about fellow Camaro5 family but I'm in it for the performance so LT's it is for me...thanks for the good feedback Barry...I hope other get a glimpse of this thread before decidingwhich is right for them...
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Old 03-29-2010, 12:28 AM   #21
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Thanks barryInv, that is some good info and definitely food for thought.
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Old 03-29-2010, 12:35 AM   #22
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No prob guys, I don't mean to sound like a professor, I'm far from it, but I did get schooled when I was VERY disappointed in my gains last fall . Just trying to help my gen5 brethren (and sisters!) with what I've learned. If he's going for performance, it is more money but much better bang for the buck down the road to go with longtubes/HF cats.
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Old 03-29-2010, 12:39 AM   #23
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Im just glad to hear some realistic feedback, good or bad Id rather have all the info. Now I just need to decide if I want to try and be happy with the 15-20 HP I would get from a CAI and Shorties or just say F it and go with LT Headers, CAI and a tune. Its a tough call when youve only had your car for 2 weeks and you know you would be losing 4 plus years of warranty.
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Old 03-29-2010, 09:10 AM   #24
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I want to keep my warranty, and stay smog legal. I'm not looking for 50+hp. I would be happy with 20 hp from CAI, shorties and a catback system. I am more interested in getting better sound. This car is awesome right from the assembly line! I have my Roto Fab and a MBRP set ready to go. Just waiting on my shorties. I am also getting it dynoed before and after. Hopefully this will happen withing the 2 or 3 weeks.
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Old 03-29-2010, 10:09 AM   #25
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I want to keep my warranty, and stay smog legal. I'm not looking for 50+hp. I would be happy with 20 hp from CAI, shorties and a catback system. I am more interested in getting better sound. This car is awesome right from the assembly line! I have my Roto Fab and a MBRP set ready to go. Just waiting on my shorties. I am also getting it dynoed before and after. Hopefully this will happen withing the 2 or 3 weeks.
Let us know how it turns out. You can be the guinea pig for all guys who want to keep our warranties.

Just kidding. I decided to go for shorties as well. I am going to add a C.A.I. intake along with JBA shorties and catted mid pipes towards the end of next month. I will post my before and after dyno numbers as well.
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