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Jack Leslie's 1957 Sedan Delivery

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L32 exhaust question

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So im not ready to do this yet but i want to get as much info as i can before so. I will be replacing the cat-back dual exhaust on my gtp. I want to know if a true dual exhaust will better my performance or worsen it, i have heard both ways. Also what about straight pipes will that better or worse it? Ideas and opinions needed to thanks. If you need to know i will be going with flomaster.

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The stock catback isnt restrictive till around 350whp, iv found that the only decent sounding exhaust systems for the 3.8 are the borla, and corsa, a catback is a waste, if you want to change the sound just change the muffs... also dont straight pipe it

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