I was thinking of buying one to go sportsman racing under 500 class.

I think a more cost effective way to go would be something like an EX500 (ducking & running, lol!). I think a Nallinized Blast would make a nice canyon weapon, expecially for a smaller person. I just hope the track you will be racing on doesn't have a long front straightaway... :laugh

Maybe the guys at Crossroads would have more info about someone running a Blast in lightweight Sportsman.