Last weekend I installed 2 new K & N airfilters in my 06 roadster. The difference from a standing start is a noticeable improvement. There is no hesitation at all. You guys and gals with cold air intake systems installed, what type of performance improvements do you get??

 

I installed them in my roadster at 28k miles and only noticed slightly improved mpg. No noticeable improvement in acceleration, Maybe my SRT6 spoiled me.