Had my Yamaha dealer install the Rush Slip-ons with 1.75" baffle. It did take a lkttle "effort" to get them to slip on, but the sound is exactly what j was looking for. Even the service manager mentoned hlw heave these were compared to others they have installed. That was one of their selling points. No neec to rejet or sync the carbs. Im very pleased. Thanks for all the pointers.