I currently have a 4" mufflex exhaust with a flowmaster muffler. On my new build it just resonates something awful, both in and out of the car. Would a Spintech muffler change this sound dramatically? I am debating whether to try that or just swap back to a 3" system.

 

I personally do not like the y-pipe of the Mufflex system. I am in the process of installing and x pipe where the Y is now and running dual 3" to right before the axle where it will merge into the single 4". I just feel that the merge is too soon and creates an exhaust imbalance.

This is the way I have my Cat converter set up and the overall sound quality is superb.

 

I also didn't use their y-pipe. I did my own custom one but I did use a spintech muffler. Click the link in my sig to hear.

 

I'm not using their y-pipe, I have a MAC y-pipe and MAC headers.I also have a cut-out exiting right after the y-pipe and the sound (while obviously too loud and illegal) is far better, and sounds much more like your car, 1FastZ. I think I'll try the Spintech, I really like your sound. Any idea on the part/model # for the Spintech?

 

Unfortunately, I bought the whole kit with the spintech muffler so I can't be any help there. What I can tell you is, it is the 4 inch kit with the single in/out.

 

Has anyone ever put this kit on a dual cat car ? im thinking about buying it do you need to modify anything because my flowmaster 3in exhaust touches everything

 

If you want it to sound good, go with 3" true duals.

 

Why don't you guys like the mufflex y pipe?