hi i have an astra gsi 1998 modle x20xev im thinking about geting an exhaust made up for it from the down pipe back with no cat and only aback box in 2" diamater would this improve proformance?
how loud will it be?
what will the driveability be like?
then in a few more months a 4-2-1 down pipe
i want low and mid range torque im not realy after top end speed but dont wont to losse any top end that i have got.
ive got a pipercross element air filter to fit on saterday im also going to mod the air box ive already tacken the box thing under the inner wing off and put a cold air feed to it from the bumper what else can i doto the air box to make it butter?
what are these air filters like comared to the sandared one and other manufactures ones?
ive been told not to fit an induction kit because it wont run very well and the engine management like will come on is this true?