Exhaust
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
Dual 2.5 mendrel bends into a y that converts it to 3", run 3 all the way out the back, four gets a little tight with the axle over, tends to rub the shock.
Or just 2.5" true dual with some echo tips, old school cool
Or just 2.5" true dual with some echo tips, old school cool
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Junior User
Joined: Aug 2020
Posts: 52
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edit: will that work?
Lead Driver
Joined: Apr 2008
Posts: 6,945
Likes: 13
My 88 has 2.25" duals, my 92 is 3" down pipe into 4" that duals before the axle, 79 is dual 2.5" into 3.5" stacks. Thinking walker makes a 2.5 or 2.25" Y that is a lot better designed than stock, and not terribly expensive, want to say its for buses.
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Elder User
Joined: May 2018
Posts: 695
Likes: 22
ATS during their R&D found that an exhaust bigger than 3" was no benefit whatsoever. And that was with turboed engines which take in and exhaust 1/3 more air/gases than non-turboed, but whatever turns you on.
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Junior User
Joined: Aug 2020
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edit: if I find a 2.5” Y pipe will it bolt right up to the manifold?
Fleet Mechanic
Joined: May 2013
Posts: 1,256
Likes: 4
From: NC
The dynomax 19430 kit y pipe, which you can buy separately, is what I run, helps. It's a 3" outlet. Theres also a company called autojet who used to make a y pipe and can still make one made to order.
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