Actually, a 9" filter will fit IF you have a short intake pipe and a Pro-Flow with no flange on it. I am currently using a RE-0920 with a CTA intake pipe and Pro-Flow 75mm MAF. The 0920 is actually a little bit larger than the 3690, so the 3690 would definitely fit under these conditions.
EDIT: I am not debating whether this size filter is more or less optimal for performance. I am only stating that it will fit.
Last edited by xdouble; 02/10/04 07:14 AM.
