Originally Posted by symonh2000
I wouldn't use a K&N as they tend to kill the MAF, Personally I would rather loose a couple of BHP and use the standard paper one.
I think this is only because of the oil.. There's oil on a BMC CDA as well, its advised you either vacuum it first or remove the MAF before fitting it to the car, and let it idle for ten mins to pull through any excess. There shouldn't be excess, but its not worth the risk IMO.