Interesting points, particularly on induction. At £460 the K&N is a bit flipping toppy as well. Might just do the panels but I'm not even sure if they add any real value (apart from being non-disposable / washable).
The only reason I changed the panels was on advice for the least restrictive airflow to go with the Berk/Akro combination prior to Uprev, the advice was from a more than just a knowledgeable member, but from someone whom I consider has some expertise, ZMANALEX, who's my dad BTW ( he won't mind me saying that)
Have no idea if it gave me that extra gazillion HP or not but I took the advice and for not much money, got them, then gave them away doh!
Wait wait wait.... Zmanalex is your dad gman ?????? Well I never. That must make you jesus!