The 5b is probibly the best supported 1/5 off road out there. Where ever there is an HPI dealer, you have parts. I love my 5bss. The thing is a 27lbs missle that looks as good as it runs.
5bss slow?? I regeared mine with the Robinson Racing speed gears and I am hitting 50 mph on the street. Out of the box stock, the SS goes 45+.
I've seen some regular 5b's with better pipes run great also. You can't go wrong with a 5b.