OK so I did a search and couldn't find anything specific. I do not have any formal qualifications related to mechanics. Highlighted in bold are the bits that I think I probably will need plates for. Which of these, if any, do I legally have to go and get compliance plates for if I do the work myself (DR650): Fit aftermarket larger tank. Fit X40F1X GSXR1000 muffler + after market mid pipe. (will fall well within DB limits) Grind head pipe weld. Fit HID headlight kit. Make and/or fit windshield. Pull air box snorkel, remove air box screen, cut out top of air box and cover the hole with a piece of shade cloth. Fit aftermarket air filter. Modify, jet and fit Keihin FCR-MX 39 carburetor. I might not even bother with the compliance plates, but I'd like a bit of forewarning in case cops are able to sting me for any of the above.