ive got the chance to pick up a set of psi heads for my ultra, are they any good? better or worse then slp? also will they increase the compression of my sled? im lookin to get 145-150lbs and what are they called? thunderdome? plus if any one knows what color are they thanx

ttt

by the way... what does ttt stand for?

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anything will do that, just that everyone knows what's going on when ttt is used