Well im getting a Tanabe cat back exhaust and was wondering if anyone knew the numbers on it?? hp gain and tq gian.. unlike everyone else that doesnt live in cali we are screwed with these strict a$$ emission regulations... no catless downpipe for mee =( i hate those damn regulations im sure alot of other WRX owners do too (that live in cali) also i was wondering about a cold air intake, is there a huge difference from just taking out the resonator and sealing the intake and then buying a dop in KN or buying a AEM or INJEN cold air system?? is it really worth the extra 160=200$ instead of just buying a drop in ???