I just installed my AP exhaust with catless midpipe and everything sounds fine, but when i rev it up to ~6-7k rpm it makes a gargling noise.

is this normal?

 

Yes, it's called Rasp That's what you get with the AP.

 

did you make sure you had no exhaust leaks? I.e wait till the car cools down, jack up the front rear end nice and high and throw it on stands. Turn on the car, and immidately get down and run your hand from the header all the way back making sure that 0 air is leaking out the flanges.

 

Hmm ill have to check that one out. Its probably a leak somewhere
Thanks.