C55 factory exhaust I.D. size
Super Member
Joined: May 2011
Posts: 660
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From: Maryland
2006 C55, 1995 C36
I keep my stock exhaust in storage at my office so I measured today...2-1/4"" OD for the split sections of pipe (my dual setup reduces from 2-1/2" to 2-1/4" at the stock mufflers), 2-3/4" OD when it merges to go around the diff.
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From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
There are a few places the diameter gets pretty small. Especially between the manifold and the primary cats. Full custom exhaust with Kleemann or MBH headers is worth quite a bit of power in these cars.
Super Member
Joined: May 2011
Posts: 660
Likes: 3
From: Maryland
2006 C55, 1995 C36
I was pretty surprised about that, enough that I took a picture...2" above the primary cats iirc. I'll post the pic when I get home.
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2013 c63 Magnuson SCed
Whoever it was, that thing looked gorgeous.
EDIT: yep, t'was you alright. Any idea on power that near work-of-art gave?
Last edited by Accidental L8 apex; Mar 16, 2013 at 03:23 PM.
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From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
I'm not entirely sure how much power it gained. I heat soaked on the dyno after the first run, which was way rich. It got me a half second on the 1/4 mile though.
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2013 c63 Magnuson SCed
) looks like huge gains.
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Joined: Mar 2009
Posts: 2,136
Likes: 6
From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
Dre's exhaust is similar to mine and he got a huge gain. His car is damn near as fast as mine and he's N/A. How that he's got the cams and pulley installed, who knows.
