[QUOTE=Cunningr;604197]I ran a k&n in my turbo mondeo and high octane petrol definately feel the difference.
My boxster i have kept the stock filter because i live in a dusty area and the oiling issue with the maf. I have a fvd exhaust and noticed a bit of performance also when i run better gas.
Been messing around with cars since I was 15 so 40 years, in all cases more air in, and more air out equals increased performance! The higher octane too. So I am sure you feel a boost!
[/QU
Sorry more air in and more air out does not equal performance gains "in all cases"