Re: K & N 571 induction kit
If you look on need for speed . com I think they do an adapter for the AFM you will have to look under airfilters.
I had the KandN panel filter in my airbox, it made a small difference over the standard element, I knackered my airbox after some of the bolts seized and I bought the BMC Carbon dynamic airbox (Cone filter in a nice Carbon Fibre Box) This increased the low down torque and made it more revvy at the top end, but Im not sure it was worth the £200 odd quid that it cost. Also it was not a straight forward bolt on fitment.
The cone filter will be ok if you get a good cold air feed but it will still pull hot air in when stuck in traffic.
You could try a panel filter with a modified cold air feed to the original airbox?