Originally Posted by merdith6

try a different pipe. the 9901 is nice and smooth, and so is the plus-4. why put them together, i say put a pipe on there that will boost the power a little. i prefer the 9853ss. It gets max power from the plus-4 IMO....also mess around with different headers. I've been really liking the Nova bent headers. 3 lengths to choose from. Great for fine tuning the powerband....and ditch the 6.5mm restrictor if your using that. I always use a 7 or 7.5....and use an Nova plug....Drop the head shimming a little. Sometimes that helps...