I got the cvrx and the pull starter is the only difference... They are direct fit and I had no mods except to cut one exhaust stud... everything else was direct fit... I will tell you this... My engine starts EVERY time on 1 light pull....... roto start is a waste of time with a properly tuned engine....... I got mine from tower for $99.00 with some rebates... incredible deal... everyone else charges 160 to 180.