I put one in a while ago, purchase some PJ-1 air filter oil in spray can when you buy yours and save on shipping. It is preoiled and has a nice silicone gasket. I did not notice any performance gains either. I often wonder though if they allow larger particulates through as compared to the stocker. Common sense tells me, if it flows better as they claim, it must not be as fine a mesh or somthing like that.
Anyway, get one and keep it clean.
I wash mine in the laundry sink flushing with hot water and dish soap outwards only, then hit it with a wet dry vac, oil and your good to go another 5-8k.
"Pain is weakness leaving the body"
"Nothings possible until its done!"
"If ya can't afford the fine, take the lead!"