I have an MRT downpipe, uppipe, and HKS Carbon-Ti combo...

ive heard a few people complain about the hks downpipe, that it cracks, and that it really rather sucks... i was tempted to buy the hks, but, after hearing one guy after another complain about it, i went MRT... my exhaust is kind of loud... highway cruising is definetly loud @70 mph, but, if you like it loud, go for it.... it isnt the loudest, but, surely isnt quiet.... ive heard the scooby sport... and ive heard nothing but raving reviews of this exhaust.. i dont know about the power, but for sound, it was relatively quiet, then all of a sudden, it errupted in full song, some of the toughest sounds came out of that car... i dont know about power, like i said, sound was excellent however!!!

i had an avc-r and i ran about 15 psi, fully catted, then with the up pipe and downpipe, i ran 16-16.5.... never had any problems, just make sure you dont creep to high say past 9 so i hear on Partial throttle full boost! the factory ecu does not support to much boost at partial throttle, so.... if you get too much boost, you'll lean it out!.. i dont want to scare you, just food for thought!