Noise after exhaust installation
 

i just installed a SLP LM 1 and a mrt catted h pipe 3 weeks ago and it sounded great but now im starting to hear a squeaking noise. when my car idles and i rev it i don't hear it but when i start driving i hear it everytime i press on the gas. when i press on the gas i hear it for a few seconds and then it goes away. anyway i was wondering if any u guys would know what the problem is. thanx

Who installed it? If it was you did you support the rear end on jack stands and the front wheels on the floor (this is to simulate the car being on a flat surface and suspension at regular ride height) and make sure there was no rubbing anywhere?

i had a shop install it when they did it they lifted the whole car. what do u mean by "make sure there was no rubbing anywhere." snaps i'll go back to the shop this weekend to let them check it out

If shop did not tighten it up enough it may have come loose therefore rubbing somewhere on the frame or driveshaft.