I see no reason why it would be illegal. Not changing carb size etc. I used to race 1/8 pan cars years ago and they would ck the carb, etc. Thermal would be the man to ask. He's doin alot of racing. I'd be interested to know where you tap in at on the motor. Don't wanna pull mine back out to lookyloo if you are. We'd have to pull the starter, etc to see if there was clearance on the side somewhere.