I put a k&n on my sisters cooper didnt really notice a huge differance just a tiny bit more throaty. Personally i would say get the a cone filter will notice the differance and if your worried about warrenty they dont really mind, well mine dont. Ive got my last two second hand alot cheaper and give them a clean up and there as good as new. K&N are always good nicer noise on a Mini ONE, Pipercross Sounds good on a Cooper. Recommend both put a good grunt in your car.
Mark |