just wondering. I have one on my sled but am going to do some testing to see if this is the case.
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It hits 8200 then tapers down to 7900 with stock helix.
I can only pull 8150 with 62 gram factory weights at home(2700 ft) with the pc5-156 hp map. last year with no pc5 in the mountains I ran 7850, would bounce to 8000 the odd pull. we ride between 5 and 8500 ft in the mountains.
at the advice of my dealer when i bought the sled i put in a clutch kit, the helix is a 66-44-46, not sure on spring, would have to check.
Another vote against the mbrp, just noise makers in my opinion and typically they are tighter than stock causeing lean condition in midrange, probably what you are feeling as a gain. It sounds to me like you have some lake racer helix in there. you need to look for lower angles like 58,40,46 or 58,38,46 for a good mtn set-up. Call Curt at fastrax