Thumper 520 pump gas reviews

[assaultn]

Hello folks. Im going to freshen up the top end on my 13.5 sxf450. Any reviews on the thumper racing 520 set up for pump? More than likely run the pr2. 520 still worth it if stock jug looks good as is? If I have to replace or recoat stock jug cost is pretty much a wash anyways. Will likely run pr2 with either setup. Any thoughts?

 

[barefooter]

YOu will love that set up. Rode a 520 with the Raze ECU last week. I was impressed. Almost as fun as my 330. I have heard good things about the PR2 as well.

Most guys that I know doing work on a 4T are just saying screw it and going with the 520 kit