I installed these things about 2 months ago along with the Nology coils and wires. No more carb tuning. No more flat spots. Immediate start up. Smoother idle and shocking acceleration. Had to change to a 17 tooth spocket because 2nd gear came way too quick. The bike now sounds meaner.
Thanks to the performance gurus at British Customs. They are my friends and mechanics. It helps that I live 1 mile from them.

Doug

http://www.bonnevilleamerica.com/photopost/showphoto.php?photo=7065

http://www.bonnevilleamerica.com/photopost/showphoto.php?photo=7064