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Old 11-06-2013, 07:59 PM   #86
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Originally Posted by grocerygetter View Post
you know this is all selfish of me, right? Trying to justify the cost of a header/dual 3" set up gamble.
Looking back I was a little aggregated on my post. I had just got the text about me picking the kids up lol. I'll have some more info tomorrow.
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Old 11-06-2013, 08:24 PM   #87
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Glad you saw some gains from it. I think i'll pulley down to 3.2" instead though. The drone on mine with a full 3" was just too unbearable.
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Old 11-06-2013, 09:02 PM   #88
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Bo, what blower do you have again?!
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Old 11-06-2013, 09:14 PM   #89
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Quote:
Originally Posted by Bo White View Post
Second pull overplayed over best pull from last visit:
That is what I expected from a bigger exhaust, at your HP level. The gap widens as the rpm's increase. Did you happen to log boost? Wondering if you lost any. I wouldn't expect you to lose much if any but thought i'd ask. Very nice numbers man.

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Glad you saw some gains from it. I think i'll pulley down to 3.2" instead though. The drone on mine with a full 3" was just too unbearable.
Do you still have your 3in exhaust? If so, a set of J-pipes would take care of that drone for you.
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Old 11-06-2013, 09:22 PM   #90
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Oh, and Bo, did you ever modify that OBX exhaust to be a full 3 inches? Or does it still have that 2.5 downsize at the connection of the cat-back?
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Old 11-06-2013, 09:58 PM   #91
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I lost 1/2lb or so from last time. I have the ECS Paxton 1500 kit. The exhaust still necks down to 2.5 at were the cats were.
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Old 11-06-2013, 10:14 PM   #92
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Ah, you have a centri blower. That's what I'm looking to do after some ported heads and a mild cam. Can't wait. Maybe by next Summer!
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Esmeralda (03 GT) - UDP, CAI, PP intake manifold/upper plenum/75mm TB, 4.10s, fully rebuilt/upgraded trans w/ Transpak, 2400 stall converter, full O/R exhaust, 04 Cobra tank/dual 255 LPH pumps, Sniper Tune!!

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Old 11-06-2013, 11:28 PM   #93
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Darn it. Freaking results.
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Old 11-06-2013, 11:37 PM   #94
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Well just remember that's a lot of power going through a 2.5 cat back. A bolt on car will show differently for sure.
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Old 11-07-2013, 12:56 AM   #95
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When I first bought my car new, I added the SLP Long tubes and a full 3" Exhaust and my car dyno'd right at 30HP more than stock without at tune. So the headers or the exhaust or the combination of the two did something. This was put on an otherwise completely stock setup. Although having the AFM deleted couldn't happen soon enough. The noises coming from exhaust caused by the AFM engaging was barely tolerable. Farting, burping, coughing, droning. Terrible. After we did the LS3 conversion, it turned into music.
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Old 11-07-2013, 07:20 AM   #96
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Nah...under 600 horse I'd bet there is no difference with diameter...don't read more into this discussion than it is. It has got side tracked a bit to cars around 600. Bo and I fall into that category. SixG...u do too on the bottle.
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2014 GMC CC Z71, 2009 C6 vette (672/639 at the wheel and less than 3300lbs)
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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.

Thanks to:
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Old 11-07-2013, 07:40 AM   #97
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Nah...under 600 horse I'd bet there is no difference with diameter...don't read more into this discussion than it is. It has got side tracked a bit to cars around 600. Bo and I fall into that category. SixG...u do too on the bottle.
I'm not gonna get into any debate over this. But I will express that I disagree. I feel that a 3 inch exhaust even on a NA vehicle will have some gains over the stock 2.5 inch. Maybe not soo much over an aftermarket 2.5 inch. I side-tracked this thread when I said that people keep saying there are no gains to be had despite there being a lack of evidence to prove such a statement. Nobody has dyno tested a car after a 2.5 inch to 3 inch exhaust swap even tho an exhaust change on this car is easy peasy...yet somehow this rumor (or straight up lie) keeps getting repeated. But, until we get a legit answer...
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Esmeralda (03 GT) - UDP, CAI, PP intake manifold/upper plenum/75mm TB, 4.10s, fully rebuilt/upgraded trans w/ Transpak, 2400 stall converter, full O/R exhaust, 04 Cobra tank/dual 255 LPH pumps, Sniper Tune!!

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Old 11-07-2013, 01:36 PM   #98
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I will say my car rev'd faster it seemed after I went to aftermarket 2.5 (what I have now).
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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:
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Old 11-12-2013, 03:16 PM   #99
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well....just since we talked here...I believe there would be something to be gained. But I am adding headers at this point and testing that gain under cam+FI. After that, we'll see if it is still nice on the interstate (no drone) like it is now. If not, then heck with it, it will get 3" all the way out the back. If it stays docile at interstate cruising then I will ride out the 2.5". The car is making power and has ET's to back it up with stock manifolds, no cats, and dual 2.5" custom exhaust, now. LOL
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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:
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Old 11-12-2013, 04:59 PM   #100
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well....just since we talked here...I believe there would be something to be gained. But I am adding headers at this point and testing that gain under cam+FI. After that, we'll see if it is still nice on the interstate (no drone) like it is now. If not, then heck with it, it will get 3" all the way out the back. If it stays docile at interstate cruising then I will ride out the 2.5". The car is making power and has ET's to back it up with stock manifolds, no cats, and dual 2.5" custom exhaust, now. LOL
Lol bought time.
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Old 11-12-2013, 08:14 PM   #101
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Lol bought time.
+1. At the very least his car will sound better. Especially if it drones and he goes full 3". It will sound amazing. I know mine does!
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Old 11-12-2013, 11:44 PM   #102
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If I'm wrong about 15 or less hp I'm gonna owe some " y'all told me so's" to u clowns. We'll see soon enough. At least someone will have some printed knowledge when I am done.
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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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