I have started my pump swap and found that I have an OEM impeller in the pump I am using. Can I just run the OEM one it looks okay.... and save up for a the Big Swirl or could I use a 14/19 or 15.5. How much is a good price for these? I have never messed with pumps before so this is all a learning experience for me. I am also not sure how to get the impeller out of the pump? I think I have to order the spline tool, but then what, 
Obviously I am interested in low end for freestyle. The ski has a pipe, intake grate, ride plate, and thats about it right now. I am trying to figure out the next mod this winter but am leaning towards milled head and lightened flywheel.

Obviously I am interested in low end for freestyle. The ski has a pipe, intake grate, ride plate, and thats about it right now. I am trying to figure out the next mod this winter but am leaning towards milled head and lightened flywheel.