noob question but when would I need to change the air filter?

 

Damn, I thought I was getting raped when I paid $51/gal of synthetic Repsol and $12 per filter at my local CT stealership. I got my K&N for $62 on Ebay.

Did it chaffe afterwards? You know, when they ***-f*cked you?

I'd be pissed too.