Bike is a 06 with roughly 10000 miles. Bike was running fine the other night until I decided to make a high speed run (150 +). As I was slowing down I noticed the exhaust tone had changed. When I came to a stop it felt like the bike had developed a miss.At low rpms it was sluggish.Once I hit 3500 it ran normal. I pulled plugs and they were shot so I put some new ones in. The miss is still there and now bike wants to pop and backfire. Rode it for about a mile and bike has no power through all rpms and noticed a nice orange glow coming from exhaust starting at cats and going past where it makes the upwards turn towards factory cans. I'm thinking cats may be clogged and will check coils with ohm meter in a few. Have already checked all connections and will recheck the gap on plugs when I check the coil sticks. Anything else to check?