Maintenance time

This Thanksgiving I'll be doing some minor work on the m3. Fuel filter, cabin filter and intake filter. It's all OEM parts. I vacillated about getting the K&N stock replacement filter or the CAI kit. After much research I found that all the expensive options were either hype, not worth the money or potentially dangerous.
1. Really good write up on performance upgrades and which ones make sense. Apparently any cold air intake which leaves the filter visible is crap. And the only ones that will possibly give performance cost more then a grand.
http://forums.m3cutters.co.uk/showthread.php?t=6436
2. Apparently the oil used in the K&N stock airbox filter can cause the MassAirFlow meter to fail. So much for that.

Cost of parts was less then $80.

Shipped From NoCal Warehouse	13-32-7-831-089-M67	Fuel Filter, M3 (2001-06), Each NEW FEATURE: Write a Review for this item!	1	$29.25	$29.25
Shipped From NoCal Warehouse	13-72-1-730-946-M63	Air Filter, E46 323i/Ci, 325i/Ci M56, 328i/Ci, M3, Each Brand: Mann NEW FEATURE: Write a Review for this item!	2	$12.25	$24.50
Shipped From NoCal Warehouse	64-31-9-071-935-M87	Activated Carbon Microfilter, BMW E46 3 Series, All (1999-04), Each NEW FEATURE: Write a Review for this item!	1	$22.25	$22.25