I have a set of K&N's and they basically paid for themselves, if anything the mod is well worth it for that reason. Why keep buying air filters if you can just buy one set that last the entire life of your bike. I've been seeing many K&N's going for dirt cheap on Ebay.
Just a thought, can't say I've noticed a huge gain in performance, but I bought them to save money. I've since put them on my truck and my car as well.
I also have a Scott's permanent oil filter which I think helped save money in the long run. It's well worth the investment in my opinion.
A power commander is definitely a great mod though, I got lucky and the RC I bought already had one on it. But, like everyone else has said, if you want performance gains get the PC. But, I can't honestly say that the K&N's didn't save me any money. Basically all if ever have to buy now is new oil, the rest is covered.


