I know that Wiseco is the better piston. But when I got my new cylinder, it came with a stock Polaris piston. I'm going to change down the road, but do to $$ I don't really want to spend the money right now. But I was comparing the stock piston with on of my older Wiseco's I have and noticed the intake holes on the skirt of the piston's are considerably different. The stock piston has holes I can't get my pinky in, while the Wiseco I could stick my thumb in. I'm sure there is a power difference, but I was wondering how much of a difference there is?

 

the wiesco i put on my rail blazer gave the quad about 3-5 hp according to te box and my dealer told me it ould add 3-5 also