Exhaust performance question
Thread Starter
Instructor
Joined: Jul 2003
Posts: 112
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From: Little Elm Tx
Exhaust performance question
I have a 71 coupe 350 bored.30, flathead pistons, edelbrock performer 7500, Holley Dominator 650, Comp Cam and ORIGINAL HEADERS.....Needless to say the guy I bought the car from left the original headers on it. I want to redo the exhaust and need advice on what I should do and what kind of performance I can expect. I like the Hooker Headers and maybe throw some sidepipes on.
Race Director
Joined: Feb 1999
Posts: 16,978
Likes: 7
From: In Dreams There Is Truth Ohio
Re: Exhaust performance question (Clown Puncher)
I would guess the minimum would be 25-35 HP increae....more if you have more mods...bigger cam, head work, compression, etc.
Melting Slicks
Joined: Apr 2001
Posts: 3,399
Likes: 278
From: Olmsted Falls, Ohio
Re: Exhaust performance question (Clown Puncher)
Sidepipes look great but the HP gain numbers are less than true duals straight back because of the radical bends. Still, unless you are racing - who cares? Put on the sidepipes!
Hard to estimate without knowing what is on now - if you are running 2" to old mufflers and you upgrade to 2-1/2" with good flowing mufflers would probably gain you 25-35 HP. I doubt the new headers would really add a lot of gain unless the old headers are sized wrong.
Hard to estimate without knowing what is on now - if you are running 2" to old mufflers and you upgrade to 2-1/2" with good flowing mufflers would probably gain you 25-35 HP. I doubt the new headers would really add a lot of gain unless the old headers are sized wrong.
