Quote:
Originally Posted by josec70
I"ve not yet done it on the F90 M5 but I did it on my 15' M5 w/ K&N Drop-ins and there was a notable improvement in sound (compared to stock).
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I think I'm going to remove them. I don't see how it could hurt. The K&N decision I'm a little more skeptical about given the mixed results on back to back dyno runs I've found out there. Seems like for some cars it helps a little, others hurts a little, some no change. I'd love to see back to back dyno runs on the f90.