Well on my CRF450 i change the engine oil after every ride and the box oil every 2-3 rides and when ever i change the box oil i check the valves too as they are the main thing to cause problems.
If you are going to be using it more on road than off road don't overlook the X model as the suspension and gears are better set up for road work as you will run out of top end speed on the MX version
Exhaust wise i run a DEP S7 94db system on mine which isn't too loud so unless you get a stuck up MOT tester or bobby you should get away with it
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