I have gmmg, lt's with a off road ypipe and yours sounds a lot different then mine. Does your 355 have a lot of compression in it or something. I wouldn't think 5ci would make that much difference in the sound of the car. I have a couple clips of mine racin down the road from inside and outside and a few at the track if you wanna check em out you can hit me up on aim.

Joe

 

GMMG are great systems almost got one myself until I found a used Borla system that I couldn't pass up . I suffered from similar rasp until I put THESE in--they really cut down on my rasp and popping. Pretty cheap fix and doesn't rob any HP....

 

Will have to try these..how do i install them?

 

That's what I was talking about....I just couldn't remember the name. You just have to take your I-pipe off OR drop the y-pipe and put one in each collector there.

 

they just stay in there?! eheh

 

The directions say to drill a hole through the colector and bolt them in . I didn't want to drill through my jethots so I VERY CAREFULLY bent out the tabs on each cone and hammered them in the collectors. I've had my Y-Pipe off several times and have noticed that they haven't moved. Hope they work for ya....

 

thats what i ended up doing. So far so good, i must say these cones helped a lot more then i thought they would. Ill post new video today.
Marcin

 

Cool, I just ordered mine through a GP.