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Old 11-21-2016   #1
Dinero
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Original 1988 1 in, 2 out muffler replacement

I am thinking of replacing the original 1in 2 out muffler on my 1988 GTA with a 2 in 2 out muffler. It will sit where the original location?
Wondering if anyone out there has replaced the original muffler with a 2 in 2 out?
Will there be better air flow, increased MPG, performance increase and more throaty sound?
Any input will be appreciated. Thank you
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Old 11-23-2016   #2
Corp Z
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GTA Year: 1987
GTA Engine: 350 TPI Automatic
Re: Original 1988 1 in, 2 out muffler replacement

Do you mean installing a true dual exhaust setup? If so you have alot more to do than just the muffler. Your going to need to get a custom made setup from the manifolds back. Its possible on a 3rd gen but requires a bit of coin and skill.
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Old 11-23-2016   #3
Dinero
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Re: Original 1988 1 in, 2 out muffler replacement

I meant replacing the original muffler with a cross flow performance muffler. I do not if a cross flow will work on the type of muffler system the 88 GTA's came with?
BTw, thank you for your answer
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Old 11-23-2016   #4
Corp Z
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GTA Year: 1987
GTA Engine: 350 TPI Automatic
Re: Original 1988 1 in, 2 out muffler replacement

Any replacement muffler for a third gen GTA will be 1 pipe in and 2 pipes out. Its not a true dual exhaust. It just looks like one. Just google pictures of thirdgen firebird exhaust and you will get lots of pictures. Youtube has lots of videos of various exhaust clips. Pick the one you like.
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