well just wanted to post this for anyone who might of have the problem i had with the borla exhaust. When i would rev my car up i would hear this clicking sound. didnt really notice it uintil i got home. I look under the car while my friend revs it up and i notice the rattle again. well the pipes directly off of the cat
(h-pipe) connect in the center with each other and this is held togehter with a clamp. No matter how tight they got the clamp it still made the noise. so they decided to weld it together, and its fixed now, . So if u get the borla make sure before u leave that u dont have any noises, hope this will help someone!!
lata

 

Describe the sound your refering to. I have a high-pitched papery flutter when the revs drop down to about 3000rpms, and is a litle noticeable on revving. We looked underneith the car and couldnt seem to locate it, though we thought it was somewhere near the cats.

 

I had the same exact thing and they welded mine in the same spot and it stopped. sounds soooooo nice now.