Original Nitro RS4
I had one 2 years back ran it a few times till I stripped the spur(which is common from what the one LHS guy I used to talk to told me).
After that I let it sit for a while till I stripped it for parts for other things
http://www.hpiracing.com/instruction...ruct-nitro.htm the manual

Will say that pipe is worth a pretty penny when I was trying to rebuild mine they were going for $30+ alone.
Also it looks like he removed the purple anodizing.