whats more, we periodically have 2 have our vehicles tested 4 road worthiness, test is called MFK
Every vehicle is tested and approved is fine detail by the powers that b.
if u want 2 change or modify anything on ur vehicle to remain legal the part/ accessory u want fitted should have been tested and approved for your vehicle by the powers that be! That means somebody/business has gone to the trouble to endorse a new airfilter for example, it would cost a far bit of $$$$$ to have it tested and approved say for a softail, then on, if u wanted to fit that part on ur bike to keep it legal u would have to buy (250$ for every single part/kit) for a certified/stamped paper stating the details of the part and ur vin number from that person/business, when u next go to MFK this info is printed into your vehicle registration book.
When we take our harleys in, (bikes renowned for customising) the test mech goes off and gets the folder appertaining to the type of bike u have, he looks at everything n will point out anything that is not original, if u dont have the certified paper for it, failed test n have to pay a retest. it stinks.
Thats why we keep all the bits we take off, so we can put them back on to have it tested.