I'm new to off-roading but not new to riding and wanted to plan a trip to Colorado/Utah with a few of my friends (who are more experienced off-roaders). There were some questions and concerns brought up in our discussions in regards to local laws/rules and riding offroad. What should we know about riding off-road trails in these states? Are there rules such as requiring permits, quiet exhaust, etc when riding trails? Do most trails have manned entrances where you have to pay to get through? When I was out there last time on a sportbike, there were a couple of trails that I rode where it was just considered a road and I had no problems riding it. Also in regards to fuel delivery, we're riding a DRZ400, KLR650, CRF250 coming from Toronto (250 ft above sea level). Will we have trouble riding 14 000ft mountain passes and need to consider rejetting? (well, except for the fuel injected CRF250).