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I have a 1952 Bel Air hardtop running a 320 ci GMC engine. It has Hicson headers with 3 " exhaust. I am currently running a Edelbrock 4 bbl carburator. The transmission is a 700 R4 and the rear end is a 9" Ford with 4ll gears.

The exhaust has been run into one pipe from about the middle of the car. I was wondering what if any, gain in HP I would have if I dualed it all the way to the back? Also wondering how it would sound...does anyone out there have this set up?
 

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Hp depends on what else has been done to the engine, the sound will definitely change though. Changing your mufflers when you change the exhaust can also have a HUGE impact on sound.
 
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