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Stupid Hurts!!!!!!
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They weld onto the bottom of the piston skirt to cover up a transfer port. Apparently the port takes some of the charge away from the top of the cylinder. (from what I have heard). It worked well on the 01's and 02's. As for the newer mills, I think BJ or Cudney or even Kelsy (RKTek) have pistons that would work better.
 

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Plus Man said:
What is this piston mod and what are the performance gains
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They weld material on the exhaust side of the skirt so it will cover the whole exhaust port.
 
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