Here is my favorite bike: '72 RD250 w/ 350 cc motor swap, Accel Superstock coils, bored carbs, massive K&N filter, and a few other minor mods. It would lift the front wheel all the way thru 3rd gear. Very scary in first! It would absolutely out-run any 600cc bike from a stoplight. But I sold it to help finance the paint for....
My favorite car: '71 Datsun 240Z Series I. 280Z motor swap, 5-way adjustable suspension, 2" suspension drop, adjustable camber & caster plates, custom 3" exaust, custom race harness mount/body support, K&N filter. On the outside, this car looked basically stock. But it ran very nice. It was a total restoration that took 8 years of my time. Every nut and bolt, body part, speck of paint, etc. was removed from the car. I did everything myself. The wife was pissed, though. It became my "red-headed girlfriend." I used to run AutoX with this car and have a hell of a lot of fun on the street. Gave many a stock 5.0 'Stang a run for their money with a 30+ year old car!
Sold it to help pay for the Seadoos...