What about with lighter tires

 

I could stick on the 12" AC rims with 25" Maxxis GT's that came on my AC 400, I'm sure it would accelerate faster, but it's already pretty quick. When the Mudzillas wear out, I'll probably replace with 28" Zillas. For where I go, actually the Mudzillas are pretty impressive, almost never need 4wd. I think without clutching, for an automatic model, they would really suck, but with manual shift, they work great.