K&N filter

everyone will have a different opinion but personaly i like K&N. I run a K&N filter with pre charger and a drilled air box. works great! yes you will see a performance difference and you should be running a aftermarket air filter with the exhaust system you have
 
If you remove the lid you will have to re jet , If you just swap in a k&n over a stock foam filter and leave the lid on your jetting will stay the same !
 
no nothing to freak out about, if you already have a foam filter then don't worry bout it. the only differences to a K&N is, there double the money and you never have to replace them
 
I wish i could find the article that said the foam 2-stage filters out flowed the K&N cotton filter. I have seen a K&N filter ran in dust crap and some sand, no issues kept all the stuff out! I think it is personal preference! Either will help your motor breathe better.
 
I've run both. No change in Powa! I'll say I like the foam better for 1reason; i can stick a clean one in a ziPlock under my seat or in my tool box and it doesn't cost a lot of coin to have a couple around for clean spares!!!
 
I might keep my Twin air and keep it cleaned up and oiled for a spare Like ^^ just to have and be able to swap straight out , I'll probably run my k&n first to see how i like it