i have a hawk wrx and with just an exhaust (still 1 cat in place) a panel filter and a racedynamix remap i am pushing 285bhp (over standard STI power) but being the 2.5 its the torque that is so impressive, mine is 330lb/ft and it pulls like a train. with just a vf35 and another remap it can go to well over 300bhp. the gearbox is supposed to be good for 350bhp.
the total cost to get this figure......approx £700 including the remap.