Looking at picking up a leftover 2016 wr450f from the dealer and haven't owned one for years. Last one was a 426 with a decompression lever (or whatever it was called) to kick it over which was a pain after taking a spill. Anyway, I'd like the dealer to do a couple of mods now, as opposed to later, when they'll charge me more. At the very least I'm thinking throttle stop and gytr ecu. Not interested in spending $1000 on a pipe. What are oyher alternatives for exhaust? Who makes a good endcap? Airbox mods? I can get and install an endcap and filter myself but prefer having dealer do what they can so they can map it properly. Any input appreciated.