with Vader. Only one of the two works, the other is fake. Go to after market mufflers with two that actually work. 
stock exhaust, 4 tips 2 work ???
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,659
Likes: 3
From: Oxford CT
stock exhaust, 4 tips 2 work ???
Ok on my 85 vette, when O start it up on a cold day, i see the fumes coming out the two outter pipes, the inner ones have nothing coming out.
The outter pipes are used looking and the inners are new looking, still black.
If i put my hand over the outter, it does not force air out the inner.
keep in mind im talking dual exhaust, two tips on each side.
Now im pretty sure this is a stock exhuast, it doesnt really matter b.c im going to eliminate the mufflers, but whats the deal.
bad mufflers, or are stock that restricting
Dan
The outter pipes are used looking and the inners are new looking, still black.
If i put my hand over the outter, it does not force air out the inner.
keep in mind im talking dual exhaust, two tips on each side.
Now im pretty sure this is a stock exhuast, it doesnt really matter b.c im going to eliminate the mufflers, but whats the deal.
bad mufflers, or are stock that restricting
Dan
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
That's the way GM designed them. You can get O.E.M. type dual outlet mufflers at www.madvet.com for $160 a pair. GM calls them "Sport" mufflers. I have them on my 1989 Z51. They are supposed to be worth 5 additional HP. On most L98's only 1 outlet works.
Pro
Joined: Nov 2006
Posts: 729
Likes: 0
From: Concord North Carolina
That along with the three cats is what restricts the L-98s horsepower so bad. I gutted two main cats, removed third giant cat, converrted to true dual and welded on some tips. Sounds better and seat of the pants seems higher IMO.
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Federal noise requirements are probably what made them do that, and yes it is stock, though it did not continue for all cars (depended on optioning in later years).
read my website, the whole exhaust system is restrictive
read my website, the whole exhaust system is restrictive
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Burning Brakes
Joined: Jun 2006
Posts: 1,096
Likes: 28
From: Baltimore MD
Originally Posted by corvettedan22
I cant belive that Chevy was putting fake exhaust pipes on their cars.. Thats crazy !!
I had an old 75 Camaro...single exhaust back to tranverse mounted muffler with two outlets...two tailpipes that were about 2 feet long...but not real duals...Same with Monte Carlo SS, Buick Grand National, Olds Cutlass 442's of the 80's...Two tailpipes, and sometimes two mufflers as well, but not true dual exhaust by any means.
Even our C4's don't have "real" dual exhaust from the factory, even though they have two mufflers.
Team Owner
Joined: Jun 2001
Posts: 26,196
Likes: 0
From: Orlando FL
St. Jude Donor '08-'09
Very few stock cars have true dual exhaust.
But are you glad you have a fake pipe and "not true duals" than if you just had a single pipe sticking out one side? That would look pretty ghey now wouldn't it? I'll take my "fake" exhaust any day over a single exhaust tip sticking out of one side only
oh yeah, gutted cats and borlas here
But are you glad you have a fake pipe and "not true duals" than if you just had a single pipe sticking out one side? That would look pretty ghey now wouldn't it? I'll take my "fake" exhaust any day over a single exhaust tip sticking out of one side only
oh yeah, gutted cats and borlas here
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Yep, that is the way GM made those mufflers. Even the Dynomax mufflers I have on my 86 are that way.
You can eliminate the two precats and install a high flow main cat and the muffler eliminators. It make for a loud ride though.
You can eliminate the two precats and install a high flow main cat and the muffler eliminators. It make for a loud ride though.