1st Gear Member
Join Date: Jun 2004
Location: Sweden - Stockholm
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a good start is always a K&N filter...they do real good work but if your looking for the best go for a gruppe M, they are expensive but worth it from what ive heard...
i have a cone filter from K&N for about 80$ and i noticed a great difference in power...well okey not like a turbo or something but it was noticebl...
they also give your engine a better response time...which means when u push the pedal it will react quicker
Black E39 530i 2001 with full black leather interior and antracit roof.