The newer dynamites are rare in this area for some reason. My buddies tuned pretty easy and put down some good power in his truggy. I don't know what a stock B5 is like, my modded one is big power and isn't finicky. I did tune a stock B6 for another friend and it was probably the fastest buggy at the track that day. There's alot of good engines around the $200 price these days.