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Old 11-06-2013, 10:14 AM   #71
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My 3 inch cat back was a billy boat and it weighed a ton. I would not suggest it to anybody. Fit was terrible and it was heavier than stock. The 5-6 feet of stock mid pipe(factory L99 H-pipe) left on my car that goes from my dynatech cats to 13 inches before first set of exhaust hangers (at diff) is actually pretty light. The competition 2.5 inch maganflow weighs very little because it is straight pipe. I was at Jannetty Racing in august and he told me that dyno proven... the stock exhaust flows so well that a 3 inch cat back nets a couple of CRANK hp at most on N/A applications. Def not a bang for your buck mod. Trust me I feel completely stupid having spent $1400 on my cat when I could have saved nearly 1000$ and put it towards a Cam like NIGHT FURY! thats bang for your buck awesomeness.
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JRE cammed w.full bolt ons 444rwhp/422rwtq
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Old 11-06-2013, 01:44 PM   #72
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Quote:
Originally Posted by camaro500 View Post
My 3 inch cat back was a billy boat and it weighed a ton. I would not suggest it to anybody. Fit was terrible and it was heavier than stock. The 5-6 feet of stock mid pipe(factory L99 H-pipe) left on my car that goes from my dynatech cats to 13 inches before first set of exhaust hangers (at diff) is actually pretty light. The competition 2.5 inch maganflow weighs very little because it is straight pipe. I was at Jannetty Racing in august and he told me that dyno proven... the stock exhaust flows so well that a 3 inch cat back nets a couple of CRANK hp at most on N/A applications. Def not a bang for your buck mod. Trust me I feel completely stupid having spent $1400 on my cat when I could have saved nearly 1000$ and put it towards a Cam like NIGHT FURY! thats bang for your buck awesomeness.
We're talking 600+whp supercharged engines though.
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Old 11-06-2013, 01:51 PM   #73
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I'm leaving for the dyno now. Post up in a few hours.
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Old 11-06-2013, 02:28 PM   #74
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Quote:
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We're talking 600+whp supercharged engines though.
OOOPS MY BAD
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Old 11-06-2013, 03:43 PM   #75
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Last time I was here it made 569.7 it made 588.8 first pull cold. I'll post later on some average runs.
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Old 11-06-2013, 03:50 PM   #76
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Bo...temp/DA differences? if so, MAF gains before after?
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-654whp with a few cosmetic things, Pfadt suspension, Vortech, CircleD, GPI ss3 vvt bump stick, gears, stuff in between,18" TSW N'rings for drag duty, 20" Forgestar F14s for street.

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Old 11-06-2013, 03:58 PM   #77
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Dang it......give me a sec.....lol
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Old 11-06-2013, 04:11 PM   #78
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you know this is all selfish of me, right? Trying to justify the cost of a header/dual 3" set up gamble.
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2014 GMC CC Z71, 2009 C6 vette (672/639 at the wheel and less than 3300lbs)
2010 Camaro 2ss/rs---SOLD 4/15/14
-654whp with a few cosmetic things, Pfadt suspension, Vortech, CircleD, GPI ss3 vvt bump stick, gears, stuff in between,18" TSW N'rings for drag duty, 20" Forgestar F14s for street.

Thanks to:
Tony@ dv8motoring
rhino@ Gwatney Chevrolet/GPI Jacksonville AR
TCAudio in Benton AR
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Old 11-06-2013, 04:18 PM   #79
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Second pull 587.9
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Old 11-06-2013, 05:07 PM   #80
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Wow, almost 20rwhp just by switching to a 3in. Are the temps similar between the two visits?
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Old 11-06-2013, 05:11 PM   #81
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This says a lot...even if Bo has forced induction. Can't wait till I get some boost under the hood!!
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Old 11-06-2013, 06:09 PM   #82
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3.2% gain on the second pull. Too bad we don't know the da on both days.
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Old 11-06-2013, 07:49 PM   #83
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I had to leave early to pick up the kids(plan changed on arrangements while I was there). These are SAE #s so they are close to correct. The conditions this trip was 75.5* 29.34" and 45% humidity so I'll have to look on my old sheet to see what they were but memory tells me it was about the same.
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Old 11-06-2013, 07:52 PM   #84
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So first pull was 588.8 and second pull was 587.9
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