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lkchris · 07-08-2017, 08:52 AM

Pay attention to JFP ... someone with experience.

No measured, tested proof has been posted here that the OE air box is "restrictive." No, you can't tell by looking.

A decade or more ago a fairly engineering correct test was performed with a BMW K100 motorcycle, mostly to learn about K&N replacement air filters. The testing found ZERO aitflow difference between
Stock air filter
Stock air filter half blocked off
No air filter installed
K&N

The notions that a German vehicle is poorly engineered or that its performance is "restricted" are pretty dubious. There's real world competition out there on the autobahns, and the factories know it. You're not going to create "supercharging" without a supercharger, but it would sure be cheaper and easier if you could ... and that's the fantasy appeal behind the marketing hype.

07-08-2017, 08:52 AM	#34
lkchris Registered User Join Date: Jan 2014 Location: Albuquerque, NM, USA Posts: 733	Pay attention to JFP ... someone with experience. No measured, tested proof has been posted here that the OE air box is "restrictive." No, you can't tell by looking. A decade or more ago a fairly engineering correct test was performed with a BMW K100 motorcycle, mostly to learn about K&N replacement air filters. The testing found ZERO aitflow difference between Stock air filter Stock air filter half blocked off No air filter installed K&N The notions that a German vehicle is poorly engineered or that its performance is "restricted" are pretty dubious. There's real world competition out there on the autobahns, and the factories know it. You're not going to create "supercharging" without a supercharger, but it would sure be cheaper and easier if you could ... and that's the fantasy appeal behind the marketing hype. __________________ Kent Christensen Albuquerque 2001 Boxster 2007 GL320 CDI, 2010 CL550 2 BMW motorcycles