we have been trying the 3 hole pistons of late with the smaller holes in the back to increase the pack oils were 40 front and 35 rear on grass and found the car to be good. when we get a chance we will back to back test the 1.5's and the 3 hole to give a more accurate answer but for now initial impresions were an improvement on bumpy tracks
thanks nathan
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Nathan Ralls HPI, Custom Blitz, www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline 
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