We recently spotlighted the Honda RC174 replica built by George Beale. This little 6 cylinder GP bike was a wonder in its day, … still is. One of them was at Laguna Seca last year during the MotoGP, someone caught the bike doing a warmup and put the video up on Google. If you never heard the bike, check it out. From the many spectators with fingers in their ears, it must be a loud little beast.
Links: Honda RC174 warmup video
The Kneeslider: Honda RC174 Replica