MAC H-Pipe sounds funny???

[IMTOPLS]

I recently installed a MAC offroad H-Pipe on my '95 GT convertible. At the same time, I installed a new Flowmaster Force II cat-back system. My reason for posting is that it sounds weird! Standing behind the car or when I get on it, it sounds like it's supposed to sound, awesome! It's when I am maintaining speed and the exhaust is quiet out the tailpipes that is a problem. From the front of the exhaust (the H-Pipe part), it sounds like the exhaust is leaking. I've checked it up and down with the engine running and cannot find any leaks anywhere. Yet, when I'm accelerating normal, I hear the exhaust under me rather than out of the tailpipes. I had an '88 5.0 in the past with the same Flowmaster system but with stock H-pipe w/cats and did not have this problem. Anyone out there running the same system? Do you have the same problem? Do I need to get another H-Pipe?

 

[cb18201]

i do know that the force two is supposed to be quieter

 

[IMTOPLS]

And it is quieter. But the resonation I'm getting from the H-Pipe makes sounds like an exhaust leak. To me, it just sounds like a car with a loud exhaust. Like I said, it sounds great at the tailpipes, it's between the exhaust manifolds and the mufflers that the problem...I was just curious if anyone else has run into this.

 

[wytstang]

Is this an off road h pipe? It may just be normal you are just used to the stock catted h pipe. Or you do have an exhaust leak some where try using a piece of hose and listening around the flanges.

 

[IMTOPLS]

Yes, it is an offroad H-pipe. I'll try the "hose at the flanges" trick. Thanks!

 

[mystang94gt]

Well if it is an off road H-pipe there is going to be a lot of extra noise coming from it all the time. Your going from 4 cats to none. So you have to expect a lot more noise from that part of the exhuast.

 

[IMTOPLS]

Thanks for the info. I've had several old muscle cars with dual exhaust with no cats that have not sounded this way. This is my first with an H-pipe so I didn't know if it was a characteristic of the H. If I have to live with it, I'll live with it. Thanks again for all the help guys!

 

[iluv95stangs]

I have a mac prochamber and can also hear this noise. I have been on a few different forums and there are a lot of people that have the same noise and they say it is normal for mac. It does get aggervating though.

 

[95CobraStang]

Im guessing it's a swooshing style air-moving-through-the pipe sound....and you hear it at low rpms when you give it some gas. If that is the sound, it is normal. Thats what i had in my 95 Cobra w/ american thunder and mac o/r h pipe... I actually really liked the sound!

 

[Jsun3701]

MAC

I have a MAC prochamber, when I got it at first sounded great. Then within a week it sounded a little loud also. I put it on the lift and noticed one of the welds by the cat had poped. I had a friend cover the exhaust and I ran my hands over the exhaust to find it. It was small but it made a difference in sound.