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Old 04-24-2010, 12:12 PM   #18
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scrming, just curious what gains did you see with your shorty headers?
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Not much... Mrray13 showed about 5 rwhp... I seen a small improvement in my 0-60....

Yep ~ 5rwhp and 8lb-ft of torque.


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Even with the Trifecta tune you didn't see much? I mean 5rwhp isn't that bad, but anything below that..

Never ran them with the tune, so no idea what they would have produced. I'd guess another 2-3 rwhp and 2-3lb-ft of torque.


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Yep.... But it sounds so good!!!!! in fact I am sitting on my front porch randomly remote starting my car so I can listen to it!!! (digging this iPad thing.. Lol)

Yes they did! Definitely a nice aggressive note!




All that said, I'm not for sure the DTs will make much more power then the JBAs did. Those numbers look really, really good though, and I hope they are accurate. Of course, like scrming hinted at, different dynos, different results, lol.
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Old 04-24-2010, 01:58 PM   #19
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All that said, I'm not for sure the DTs will make much more power then the JBAs did. Those numbers look really, really good though, and I hope they are accurate. Of course, like scrming hinted at, different dynos, different results, lol.
Stupid variables
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Old 04-24-2010, 07:36 PM   #20
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Yep.... But it sounds so good!!!!! in fact I am sitting on my front porch randomly remote starting my car so I can listen to it!!! (digging this iPad thing.. Lol)

lol Nice.. I was checking my posts on the Ipad also. Makes a lazy man lazier now. Now i don't even have to sit upright at my desk to check the internet. Now I can lay on the couch.

Now they just need Ibeer.

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Old 04-24-2010, 07:53 PM   #21
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lol Nice.. I was checking my posts on the Ipad also. Makes a lazy man lazier now. Now i don't even have to sit upright at my desk to check the internet. Now I can lay on the couch.

Now they just need Ibeer.

Got the IWife to get the beer...
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Old 04-24-2010, 08:03 PM   #22
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How much different does it sound with the shorties. and do you still have stock exhaust, or an after market. give us a vid of the sound.........
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Old 04-24-2010, 09:56 PM   #23
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Okay, I promised I'd report on the sound/power changes.

Both are noticeable improvements. The sound is dramatically different. I've put 7000 miles on the car with just the DT Catback, so I know how this car sounds. The headers really changed things. It's actually quieter at cruising speeds and the rasp I would sometimes get around 4500 rpm is basically gone. I would describe the sound as smooth.

It's not boomy or intrusive in the cabin, but it roars when you step on it. I made a little video that gives a sense of it. If anyone knows how to embed this, please do:



As for the power, there is a difference. The dyno shows about a 8-14% gain in torque. I'd say that's about what if feels like. 10% isn't overwhelming but it is noticeable. If I had a Dashawk, I suspect I'd have dropped at least a 10th of my 0-60 time.

I did do a run on the on-ramp from 0-70. Usually when I punch it, the tires chirp a bit before they catch. This time, I heard them rotate on the pavement. It sounded like pulling a single sheet of paper out of a pack and the car slid over a bit before it caught pavement.

So, the sound is fantastic (to my ears). The power increase is there. I wish I could confirm it on the track, but the nearest one is an hour away. Hopefully I'll be able to afford another dyno run after I get my intake replaced.
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Old 04-24-2010, 10:07 PM   #24
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Got the IWife to get the beer...

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Old 04-24-2010, 11:09 PM   #25
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Sounds good. Almost sounds like my LS3 does ont he inside upon acceleration. Thanks for the video......
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Old 04-24-2010, 11:51 PM   #26
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Okay, I promised I'd report on the sound/power changes.

Both are noticeable improvements. The sound is dramatically different. I've put 7000 miles on the car with just the DT Catback, so I know how this car sounds. The headers really changed things. It's actually quieter at cruising speeds and the rasp I would sometimes get around 4500 rpm is basically gone. I would describe the sound as smooth.

It's not boomy or intrusive in the cabin, but it roars when you step on it. I made a little video that gives a sense of it. If anyone knows how to embed this, please do:



As for the power, there is a difference. The dyno shows about a 8-14% gain in torque. I'd say that's about what if feels like. 10% isn't overwhelming but it is noticeable. If I had a Dashawk, I suspect I'd have dropped at least a 10th of my 0-60 time.

I did do a run on the on-ramp from 0-70. Usually when I punch it, the tires chirp a bit before they catch. This time, I heard them rotate on the pavement. It sounded like pulling a single sheet of paper out of a pack and the car slid over a bit before it caught pavement.

So, the sound is fantastic (to my ears). The power increase is there. I wish I could confirm it on the track, but the nearest one is an hour away. Hopefully I'll be able to afford another dyno run after I get my intake replaced.


Great video, thanks! It sounds really good. Do you have any pics of the headers?
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Old 04-24-2010, 11:57 PM   #27
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Great Job on the video.. Sounds awesome man!
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Old 04-25-2010, 12:56 AM   #28
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Sounds great, I'm really considering this!
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Old 04-25-2010, 01:06 PM   #29
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I had the JBA shortys listed on the V6 exhaust sticky thread, so I thought these deserved a place there as well! Added!

Thanks John for the info.
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Old 04-25-2010, 06:42 PM   #30
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I thought these deserved a place there as well!
Thanks.

Here's a pic of the headers installed. You can see the sensor and cat below.
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Old 04-25-2010, 08:48 PM   #31
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Surprised no one has asked the burning question yet....Check Engine light???
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Old 04-25-2010, 09:57 PM   #32
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sounds nice!

the dyno guy wasn't very consistant in his starting and ending the dyno sampling at the same rpms, this is why you're seeing a variance in start end rpms on your graph, it's a shame, that would give a better measure of comparable hp/trq #'s side by side. I bet you gained all the way up, just looks like they got off the gas at 6kish and you see the decline on the dt run. congrats on the gains! how much were the headers/cats?
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Old 04-25-2010, 10:30 PM   #33
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Surprised no one has asked the burning question yet....Check Engine light???
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Old 04-25-2010, 10:56 PM   #34
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how was the install? I am guessing you would take the cat and downpipe out and weld them to new headers and then put it back in as one unit?
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