M5 Expert (>4000)
Join Date: Jul 2006
Location: New York
Thanked 559 Times in 344 Posts
I have the RPI Scoops/BMC filters combo and am very happy with it. I have had not thrown any faults - even when my car was driven (by somebody else of course) at 13.0+ mph.
Keep in mind that Extassy has many many other mods that might be a contributiing factor to the reduced power fault he received.
If how your car looks with the hood open is more important to you than performance, get the K+Ns. Keep in mind that at least a few members have pulled the typhoons b/c they got sick of throwing faults.
2014 M5 Competition|Space Grey|Black Merino Full Leather|Anthracite Trim|Executive package|LED Lighting Package|Drivers's Assit Package|B&O Sound System|Bel STiR Plus 9500ci|IND Side Markers and Side Vents|Exhaustmeister|Pirelli Sottozero Serie II
Past Rides:'07 M5 Silver grey/Black(Nicely Modded)|'04 745Li Titanium Grey/Black|'01 740iL Titanim Silver/Black|'91 K1100RS|'88 K75S