Don't be a hater Ian, just cause you can't tune nitro's ....
Glad to see you are finally going to run something with a combustion engine in it!
And since you are running 4 stroke, you can run a straight pipe.....
So if you could please, run the pipe right out of the side of the body of the truck, and make it a short pipe, and then run it at night and get a video, because I want to see the flames coming out the exhaust pipe!!
Anyway, good luck with it. If your results are really good, I might just consider stuffing a 4 stroke in my OFNA Mutilator truggy (As much as I would hate to get rid of the beastly .32 it has in it right now)