I checked my filters on the weekend, had to clean out a fair few dead bugs and bits of leaves. I think the car could really do with some good quality air filters. I've used a K&N panel filter on a high(ish) (7000rpm) revving 4 cylinder car before and it seemed to give better response and possibly a tiny bit extra oomph, though not substantiated.

Has anyone got K&Ns fitted? Are they worth the extra few £s/$s on the Crossfire?