I have a 92 hatch si...d16z6 with a custom cat back exhaust. i used 2.5" aluminized back to a silverline can style muffler.....it sounds decent but it has a buzzing sound at certain times...it doesnt do it all the time....only around 3k if im slowly accelerating. i was wondering if it was the aluminized that made the buzzy sound? thanks for any help.

 

its typical canister sound on most NA hondas.