There is a group of riders here called the Star Boyz that do insane stuff on bikes. You can see their bikes (some have fur) at www.starboyz.com. Its pretty cool to see going down the highway at 150mph.
As far as the engine I did A LOT of research. Looked up a lot of pictures online. Went to some places that have some top fuels and looked real close. The problem was that the engine that comes in the box doesnt have enough pieces to make it look real. So I took appart a calculator that was broken and used a lot of pieces from it.
Also In the cases where the kit comes with pipes or tubes I replaced them with real wire. It looks a lot better that way. Sometimes it means cutting the plastic ends and drilling out the ends to put the wire in it.
The Exhaust on the Furry Ninja came like that in the kit. I polished it up a little but It came that way. That furr was a pain to make. I couldnt find leopard skin furr in the rite scale so I bought some furr and used a pen and drew every single stripe. That took me the longest on the bike. Then I just superglued the furr to the body.