Let me see if I can make this sound right to y'all! I like it the best when it just switches into a higher gear! When it is @ the lowest it can be for that gear. I've found it happens @ the 5's. Going 25, 35, and so on! It just rumbles and shakes my insides even. I love it! I should have ran these from the word go!! My buddy had dumps on his '01 Cobra. I never put 2 and 2 together though! This is my ideal sound though!