****ing loud as hell (not in a good way)...especially with no cat and resonators...it will be buzzy like you welded a bee hive to the back of your exhaust.

i had a prelude and when i first installed my old exhaust (greddy evo) i took out the resonator and put in a test pipe...BAD MOVE!

it sounded like arse.

literally within 72 hours i put my resonator and cat back in....

fast forward a few years later my old cat decided to go out and i couldn't afford/didn't care to buy a new one...so i welded in a test pipe (this time with a resonator)...

it still sounded like ass.