I'm planning on extending my 05 MXZ 500ss from a 121x15x1.0 to 136x15x1.5 track using the tracks usa extension kit. I've heard nothing but positive things about this kit when it comes to performance and durabiliy but I still have some unanswered questions. Anyone know if you can use the original luggage rack, tail light, and bumper? or do I need to purchase the renegade rack, light, and bumper? Is it necessary to drop a gear? Cooling problems? Any other suggestions are welcomed also. Thanks.