The size of the tips that come along with the GMPP exhaust system are a whopping 4 inches in diameter.

 

GMPP?

 

That system looks and sounds sweeeeet. GMPP= GM PERFORMANCE PARTS.

 

just to add to what purewhitemonte wrote (btw good report) I did find out later that they did send me the impala bracket, which is why I had to use spacers. I haven't swaped the bracket out yet but intend to this spring. Also, I made a FWI and that really opened up the sound and throttle responce. I still need to work on the appearence of the FWI. It's had to take it to shows and show the engine bay with it looking like it does.