Upper Plenum/ Lower Plenum
#1
Upper Plenum/ Lower Plenum
How can you tell the difference between an NA and TT upper plenum if the TT badges were taken off from the TT Plenum. I saw 3 upper plenums from the local wrecking yard today and I can't tell which one is which. How about the lower plenums are they all the same TT & NA.
#6
Thanks man!! I guess I'll be buying the upper Plenums soon. I am planning on getting the lower and upper plenum polish and ported. What power gains shuold I expect on the ported and polish Plenums? What year did they change the Lower Plenum size 90-96??
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