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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 10-02-2011, 04:57 PM   #1
damiiaaannn
 
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Shorty Headers

I would like LT headers but that would make it not pass smog in CA, but shorty headers are fine. So can you guys tell me what are the best shorties in your opinion and what type of rwhp I would get from them? Thanks.
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Old 10-02-2011, 05:05 PM   #2
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I would like LT headers but that would make it not pass smog in CA, but shorty headers are fine. So can you guys tell me what are the best shorties in your opinion and what type of rwhp I would get from them? Thanks.
Solo Performance and JBA both make shorty headers. Mine are JBA.

My shorties and high-flow cats did very well on the track for me.

I think you'll be pleasantly surprised. If you can get the high flow cats also, they are the biggest gain. The shorties gain, but the high flows gain more, and together, sweet. The high flows don't involve moving the sensors or changing the tune, so maybe you can get away with it in CA.

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Old 10-02-2011, 05:33 PM   #3
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Solo Performance and JBA both make shorty headers. Mine are JBA.

My shorties and high-flow cats did very well on the track for me.

I think you'll be pleasantly surprised. If you can get the high flow cats also, they are the biggest gain. The shorties gain, but the high flows gain more, and together, sweet. The high flows don't involve moving the sensors or changing the tune, so maybe you can get away with it in CA.

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Did you install them yourself?
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Old 10-02-2011, 05:45 PM   #4
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I've had some success at the track running Doug Thorley shorties and cutouts just aft of the OEM cats. They were easy to install and easy on the bank account.
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Old 10-02-2011, 06:00 PM   #5
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Did you install them yourself?
Yes I did. Much easier than LT's. Just got to make sure you seal things up well so no leaks. Check my Build Journal for more info and what happened when I took them to the track.

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Old 10-02-2011, 06:12 PM   #6
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None of them are good if you run them through the stock cats.
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Old 10-02-2011, 06:15 PM   #7
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I also went with the Doug Thorley, been on for 1.5 years and look brand new still. The DT's are coated and look awesome, just make sure you wipe down what ever you get before starting the first time. That way you won't get any finger prints or discoloration burnt into the pipes.
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Old 10-02-2011, 06:17 PM   #8
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If you want performance in cali, bolt on a supercharger. Other wise you are wasting your time. Shorties dont do crap and stock cats are horrible. Just do it right, and then register in another state.
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Old 10-02-2011, 06:20 PM   #9
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I would also be very cautious with the high flow cats, I haven't seen any that last very long, especially with any type of FI setup OR pass a sniffer test after you get some miles on them...
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Old 10-02-2011, 06:36 PM   #10
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Quote:
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None of them are good if you run them through the stock cats.
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... Shorties dont do crap and stock cats are horrible. Just do it right, and then register in another state.
You guys don't pull any puches, do you?

Y'all can "dis" my shorties and cutouts, but I outran my son in his C5 Corvette with LG Motorsports long tubes:



How's that for "not doing crap"?

By the way, the OAT was in the high 90s that night.
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Old 10-02-2011, 07:03 PM   #11
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You guys don't pull any puches, do you?

Y'all can "dis" my shorties and cutouts, but I outran my son in his C5 Corvette with LG Motorsports long tubes:



How's that for "not doing crap"?

By the way, the OAT was in the high 90s that night.
Good driving does more than good power. Im glad you like your car and you should, but i will never pay money for shorties.
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Old 10-02-2011, 07:13 PM   #12
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I don't live in California anymore but......

Be aware you can't even change the Cats if you want to stay legal and pass the inspection.

You could put your stock Cats back on for your first test in 5 years though,and change them out every other year after that.

For the hassle of going through all that you might as well get long tubes.
No real gains with shorties and takes just as long to swap out.
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Old 10-02-2011, 08:00 PM   #13
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Good driving does more than good power. Im glad you like your car and you should, but i will never pay money for shorties.
I'm just yanking your chain. You didn't really hurt my feelings.
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Old 10-02-2011, 08:53 PM   #14
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I'm just yanking your chain. You didn't really hurt my feelings.
LOL. Don't sweat the lemmings. I gained about 4.5mph in my traps with just my shorties and high flow cats. Without a tune.

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Old 10-02-2011, 10:41 PM   #15
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I would also be very cautious with the high flow cats, I haven't seen any that last very long, especially with any type of FI setup OR pass a sniffer test after you get some miles on them...
This is a loaded statement. We sell thousands of systems with high flow cats, and have very few warranty claims. Even then..a decent amount of the warranty claims we get are related to the car not being tuned right. Cats don't just fail..there is almost always a cause.
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Old 10-02-2011, 11:16 PM   #16
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My son's high-flow cats have never failed an inspection here in Texas. I think the standards are higher in CA though. Between all the emissions requirements and 91 octane gas (not to mention all the additives), it must be hard to be a muscle car enthusiast out there these days. It's a damned shame, really. Especially when you consider the early days of the NHRA and how it originated there in SoCal. I was stationed in San Diego when I was in the Navy, and we used to go up to Pomona all the time for the shows and races.

To the OP: Hang in there. You'll have to decide whether you want to stay legal or not, but being limited to shorties is not the end of the world. Check out Padre's build thread before you decide. It's pretty impressive to see what he accomplished without long tubes.
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Old 10-09-2011, 10:38 PM   #17
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So most of you are saying it's not worth it?
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Old 10-10-2011, 07:53 PM   #18
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Bottom line is whether it is worth it in your opinion. In my opinion the shorty headers was worth the expense. They look good and are lighter than factory exhaust manifolds and I still have a warranty until I decide to add a cam and a tune.
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Old 10-10-2011, 08:47 PM   #19
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Why not run Shorties with bolt in midpipes......

Food for thought.
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Old 10-11-2011, 08:18 AM   #20
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Why not run Shorties with bolt in midpipes......

Food for thought.
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I agree. It seems with all the information posted, the cats are the restricting issue. By replacing with hi-flow cats, you are improving the air flow and gaining some HP.

Question: Do you improve the HP even more by adding Shorties to the Hi-Flows? If so, about how much would you expect to gain by adding shorties to the hi-flows.. 8, 10, 15? Or replacing the cats is about the best you will get out of your system as far as HP (assuming your cat back is stock)?
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Old 10-11-2011, 10:23 AM   #21
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Bottom line is whether it is worth it in your opinion. In my opinion the shorty headers was worth the expense. They look good and are lighter than factory exhaust manifolds and I still have a warranty until I decide to add a cam and a tune.
Plus, some have a ceramic coating which lowers under hood temps. They change the exhaust note from raspy to smooth due to cleaner flow...
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Old 10-11-2011, 10:57 AM   #22
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Question: Do you improve the HP even more by adding Shorties to the Hi-Flows? If so, about how much would you expect to gain by adding shorties to the hi-flows.. 8, 10, 15? Or replacing the cats is about the best you will get out of your system as far as HP (assuming your cat back is stock)?
I showed gains of 23.88 with just the Hi-flows then 19.26 adding the Shorties. I've gone over this in detail in my build journal. Gains documented by 7 back-to-back runs at the track (each).

Also,that's "Calculated" Horsepower using the Trap Speed Method. RWHP, as some calculate it, will be less (depending on how you arrive at the initial number, minus your drivetrain loss - usually 15% to 20%). But the only thing important to me was the differential between gains in Trap Speed (adjusted lower by Density Altitude).

Remember, horsepower numbers are just a tool. But my gains are real and proven at the track.

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Old 10-11-2011, 12:19 PM   #23
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Thanks Padre. I did take the time to read through your builds and I was just trying to soak it all in and make sure I understood it correctly. Data overload a little.
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Old 10-11-2011, 01:13 PM   #24
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I'm not sure why people like to "dis" the shorties. When you consider the gains relative to the cost, you could make the argument that shorties, in concert with high-flow cats and/or cutouts, give you more bang for the buck.
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Old 10-11-2011, 01:56 PM   #25
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Catted mid pipes are a safe 15 RWHP, shorties maybe 3. I have been into fox mustangs for a while, they have a tubular manifold and many a dyno has proved going to 1 5/8" shorties provide no gain until the mod list gets into head/cam/intake area. Of coarse this isn't a big cuber like the LSX series. Long tubes on a mustang is a definate game changer tho. I have also had a friend ad Solo cats and no changes got right at 1 MPH in the quarter.
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