I have the dalton plain white and blue, seems I loose 4 to 5 mph with the blue spring. Cann't tell which accelerates faster. I go back and forth with the original and mud lights. I weigh close to 300lbs. which may make a diff. Talked to epi, they said the twin peaks is different than a prari. Don't know how. She says if you modded it ,they don't have a spring for me. I thought by kiss of deaths comparisons that the blue wasn't so good on the 650. Is 700 clutch the same? I asked somebody at ricks cycle or dalton about the black white which looks good on the race times, he said he would highly recomend the blue. The blue would be faster. Confused totally;;; I top out 57 with the blue spring.