Hi, I just put a set of Cobra Speedster Slashdowns on my 1100 custom, along with the Maxair Predator Pro Kit(K&N air filters and jet kit). It is now an awesome bike. Incredible acceleration, throttle response and beautiful sound with baffles in. Got the Cobras from Pro 1 powersports(469.00) The maxair kit instructions were the best written, clear and concise instructions I have ever had for any project, much less such a technical thing as rejetting. Check out the Maxair site for customer reviews, and dyno test for this kit. You cant go wrong with this kit. Don