wow why are you selling! wish you had about a month ago just got it and it works great! anyone with a viper and not having done this should! get better mileage too now good deal!
I was running about .18 of a mile and hitting 138 - 140km at 60 and 142-143 at 70. I put it up to 80 and ran 147-148. Done this about 1/2 dozen times with each wrap. Went to stock spring and wrap and only got 134. That was WOT from dead stop. And I had transfer rods set up on top notch. I found sled was slower on bottom transfer.