Guys, guys, just an idea before you go ahead. I had a KN filter fitted in my car and I changed the filter by mistake to the original paper one. Absolutely no difference AT ALL. I know that cause I lined up with the the XR just after I did that, trust me, no difference at all.
Rob from Herrod said that as well, no increase in power on any cold air changes unless you go ahead and mod the exhaust, throttle etc. Better response???mmmmmmmaybe, that's what I call it placebo effect .