jma91678

I have a 91 gt with shorty headers hpipe and flowmasters. I am needing to replace the muffler back and was wondering witch series of flowmaster is the loudest. and would 3 in tailpipes sound better. have 2.5 now. Also i heard that it sounds better if i close off thecross pipe on the h pipe for a true dual set up? Thanks for any advise

luckythirteen13

i wouldnt plug up the cross section. it there for a reason. as far as mufflers, id go with magnaflow if you want it loud.

bobby

ya def. dont plug the h. if u want loud i got 3 words for u. ONE CHAMBER FLOWMASTERS!!!!!!!!!

89muskratGT

the connection in the H pipe is to keep the the pressure equal so like they said dont plug it up and if you want loud exaust dont put tail pipes on the mufflers

bobby

ya go with dumps, my exhaust setup is listed below with 2 chamber flows and it sounds gggggggreaat!!!!!!!!!!!!!!!! hey muskrat, i like that name, my granpa always calls mustangs muskrats

FoxGT

The connection in the H is for vacuum. You may have heard the saying that some cars these days need backpressure. They don't NEED it, but it does eliminate a little restriction. The exhaust primaries coming into one pipe create a vacuum so it will help pull the exhaust out of the cylinders. A four cylinder car with an exhaust pipe for each cylinder would be slower than one with one main exhaust.

crkitup2002

Back pressure is needed yet depending what has been done to your car. You will lose low end power in your stang if the motor is basically stock however gain top end power from a large diameter exhaust. The h-p is there to equalize back pressure and cylinder bank exhaust valve gases with unequal pressures. Don't plug it, you will lose power, plus the sound from your exhaust will be unequal. I'm running a 91 GT with a T5 conversion, Exhaust= BBK h pipe, with magnaflow catback, very louddd and sounds great behind a 5 speed.

Killa89and66Verts

Unless your car has alot of HP changing from 2.5 to 3 in will also hurt ur performance...it might look cool but it will hurt the overall performance of ur engine...also dont plug the h pipe

91GT50

I have flowmasters "American Thunder" and when you punch it let me tell the whole neighbourhood knows it !!!

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