hi what will i need to do to my x20xev in my astra gsi mk3 phase to to get 200bhp?
it has a pipercross element filter in standerd air box and its running 144.5 bhp.
sbd do a throttle boddie kit witch produces 174 with a good exhaust manafold and system.
what else can i do?
what about head work?
if i fit sbds exhaust manafold and system how much will it cost and what will the bhp be?