I have finally got hold of a k&n air filter for the s4 and what a difference...much more smoother through the gears ,more responsive and more whistle from the turbo..
It is a better air filter than the BMC ..
I have had the BMC Filter in for about 4 weeks which was a good filter but is not the...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.