| I ran with a Pipercross element in my Cooper for a while and was very pleased with it, don't think there will be much difference performance-wise between them and K&N for a panel. I have tried a K&N in a Focus as well and thought it gave good results.
I have switched to a K&N induction kit now and love the improved sound-track. I think it certainly improved low-down response and I would say torque in 5th at high speed has gotten slightly better as well. Still to run a rolling road, but there don't seem to be any fuelling issues in terms of flat spots anyway. I have tried to tailor the air supply better as well, redirecting the standard pipe's flow towards the cone more, so we'll see how it fares when the summer kicks in.
I will most likely get some ECU-tuning done with Bluefin or MTH which should sort any mixture issues that there might be and get maximum performance out of the car in current spec.
 What new bits? I didn't buy any new bits...  | 
