Dis'be what you knead! Sea'dee difference? Of course, exhaust, other than the 2 speed slush box, and a loose screw in back are mandatory; even so, a set of these will really wake the sleepy quad up.
I don't know where the heck you can pick up a set of these, and I don't know if they come any more agressive than these. (They are the most agressive rods that I have seen, but that doesn't mean anything.)
For s&giggles, sometime, I'll yank them out, bring them over, chunk'em in, and see what happens. And no, you cannot have them. The're MINE MINE MINE!