K&N air filter for 3.2 DID

[Muzza]

I know there have been posts on the this before in the old forum, for black top driving is the K&N air filter that much better, I was reading a claim of .5K per 100 better (this would equal a pay back of only 25,000K's) plus more go, seems a bit to good for me to believe.
I believe the PN for the 3.2 is 33-2164.
let me know what you think? thanks
Muzza