i know i have poasted this thread before but i want to see if anyone else has tried this set up and how are they making out with it. i unfortunatly have had only a few rides this year let alone after i installed my twins, boondocker, and ngk afr. but everytime i go out it seems to get better and better as i figure out how to tweak my non-reflashed original 07 fuel mapping. im running 70g weights a polaris blue primary spring(120-300). i wonder if i should throw a timing key in there. my overall sensus is that it pulls harder through the middle/top, sounds pretty good too.