stock airbox or custom intake?

[GU357]

Trism is right again! Do any of you guys have any form of computer control on the car to adjust the AFR mixtures and timing? If you dont, putting on any air filter wont do anything and might even slow the car down, other than giving you a suction noise under acceleration.

How I know? I happen to own a Dynapack 5000 AWD Dyno.

This is very true, although unlikely as it is still less restrictive unless the cars intake was perfectly proportional and tuned at stock.
you should disconnect the negative termanal of the battery for 10mins and then put it back on should reset the ECU, u can tell because the clock will be be reset.

just make sure what u do to the 'in' u must do to the 'out', equations have to balance.