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Im running a 07 m6 153 at about 3000 ft elevation, i love the sled and it has been clutched in the primary but the secondary hasnt been touched, cat recommends a 44/40 helix and now a stock 36 is in it, is it worth spending 150+ dollars up here in canada for one or should i just leave it alone? Im also getting a shift assist if that matters... sled is all stock except clutching. What should I do? Im happy now but maybe i would be happier how would it effect my top speed and acceloration? thanks