Paul1212

I had a Mac cat back with mac o/r H pipe and my exhaust would make a ugly spitting/poping sound in the 2-3K rpm range. I thought It was a leak checked all that and everything was fine. So I ordered Magnaflow Magnapacks and the sound quality is 10x better then Mac but I still have that spitting like sound when I accelerated in the 2-3K range. Its not the gurgling sound when you downshift its like a loud gun shot spitting/popping. Im wondering if maybe my H pipe is leaking from the header? Can anyone give me some help thanks!

dsg04gt

That would probably be compliments of your O/R midpipe.

04BlueGT

Welcome to MAC performance!

7arpad7

First I have to ask what engine do you have in your stang? The 5.0 liter engines were/are really bad about making some nasty resonance at those RPMs that you are talking about (4.6ers not as bad). I had one in my 94 GT, installed just some American Thunder mufflers (on the origional 2 1/4" cat-backs) and got some anoying sounds in that range... Then I put some MAC equal length shorties on there. The gasket leaked at the manafold and sounded bad from idle on up. I got that fixed (had to raise the engine to get to those bastard gaskets) and just dealt with the sound... I drove one of the same cars with an off road H-pipe and was annoyed out of my mind (just glad that wasn't my car)...Now I have a 4 valver 4.6 with some pretty fat cats on an X-pipeand Flowmaster cat-back rounding it off. The car is a little on the louder side, but sounds pretty kick @$$ all throughout the RPM range... That may be your fix. Get some high flow cats with an X-pipe (H-pipe if you really want, but the X-pipe will get a couple of more HP at the sacrafice of a mellower sound), and sell that nasty off-road jobber to some kidthat wants to **** off the neighbors and get all of the cops in the area up to thier ticket quota ...

It still seems strange that your car is making that sound asyou describe it...??? But, still say you should get some high-flow cats and all of that... JMO

88gtboy

Whats wrong with off road pipes? I thought They made the most power, and they sound good?

dlazrael

did you use the mac pass side flange gasket? that can be causing issues, macs gasket is worthless