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i was reading up on the jaws d series and i read that if you have a head mod you might actually loose power with them.. my sled has slp porting, speedwerxs mono 13:1 head, 1.5 timing key, bored carbs, stm valves, now i have jaws d series pipes, but also am getting a set of slp twins... which set do you think will run better? anyone with any experiance?
