Im thinking about hollowing my cat on my 92 gsr but im not sure what kinda sound or hp gain i will get.As for hp im not to conserd with it because i know it wont be enough to notice but how will it sound.I like the raspy,windy type of exhaust.
Current exhast is 2.5 custom cat back with ractive muffler,I plan to get a test pipe eventually but i got some free time so im thinking about doing it.
Noise or emmisons is not a consern.

 

It'll sound like a riced out POS. But if you like it. do it.

 

i have a hollowed out cat, but i didnt do it intensionlaly. i kept hearing this radaling noise in my exhaust. it turned out that my cat exploded, didnt really want to spend the money on a new one. it dosnt sound too bad but im also turboed so.