to both
Chambered exhaust
Drifting
Joined: Jan 2006
Posts: 1,944
Likes: 22
From: Yooperville MI
I.D. of the inner tubes on most current chambered mufflers are the same I.D. as the inlet pipe. The OEM mufflers had a smaller inner tube which was restrictive. I haven't seen any dyno tests that show the flow of current chambered mufflers to prove how restrictive they are.
Safety Car
Joined: Jun 2005
Posts: 3,775
Likes: 4
i doubt theyre that much more restrictive. the ones i have bolt to 2" manifolds, promptly flair to 2 1/2" and then at the chambered sections flare out again to 3". i dont have any conclusive proof, but id be willing to bet it flows the same as a standard 2".
Le Mans Master
Joined: Aug 2006
Posts: 7,423
Likes: 1,558
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
i doubt theyre that much more restrictive. the ones i have bolt to 2" manifolds, promptly flair to 2 1/2" and then at the chambered sections flare out again to 3". i dont have any conclusive proof, but id be willing to bet it flows the same as a standard 2".
I have the same and they sound GREAT! PG.
I have the same and they sound GREAT! PG.
Pro
Joined: Jul 2008
Posts: 699
Likes: 3
From: Millersville, MD
i doubt theyre that much more restrictive. the ones i have bolt to 2" manifolds, promptly flair to 2 1/2" and then at the chambered sections flare out again to 3". i dont have any conclusive proof, but id be willing to bet it flows the same as a standard 2".
I have the same and they sound GREAT! PG.
I have the same and they sound GREAT! PG.
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
Likes: 144
From: Van Alstyne, TX
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
This nonsense about chambered exhaust being restrictive is just that... nonsense. There are no numbers showing that this type of exhaust system is restrictive exist. There are manufacturers who make these pipes with the same diameter, inside and out. Btw, I have them and the car sounds good.
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Nonsense. 
Account disabled by request 8 Feb 2010
Joined: Jan 2009
Posts: 45
Likes: 0
I bought mine from allen's stainless steel. They fit perfectly.
http://allencorvetteexhaustsystems.com/
http://allencorvetteexhaustsystems.com/
Racer
Joined: Sep 2007
Posts: 286
Likes: 0
From: Pensacola Fla
chambered exhaust
Chambered exhaust was an option on GM cars in the 1960's,it was considered an off road option,offered a free flowing more horsepower,better sound then stock exhaust.Offered on the Z 28,SS Chevelle and the Corvette,the side pipe construction was a chambered exhaust also.RPO N11 was chambered and RPO N14 was the side pipe I believe. 
Cruising
Joined: Apr 2008
Posts: 14
Likes: 0
From: Sault Ste. Marie Ontario
Put chambered on my 73 with headers, you gotta slap the smile off my face every time
I start her up the "potato potata potato" get's me every time!!! if anything it woke the ol girl up!
I start her up the "potato potata potato" get's me every time!!! if anything it woke the ol girl up!
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Chambered exhaust was an option on GM cars in the 1960's,it was considered an off road option,offered a free flowing more horsepower,better sound then stock exhaust.Offered on the Z 28,SS Chevelle and the Corvette,the side pipe construction was a chambered exhaust also.RPO N11 was chambered and RPO N14 was the side pipe I believe.
