need advise in a 318

Yeah mini tubbing is popular cause it's not real hard to do and you can run wider tires that way. I assume you mean is a 10-11" tire enough for what your planning? I'd sure hope it is. I have seen many guys run 8" wide tires well down into the 11's no problem. Their are even guys in the FAST class running 9's on stock size tires but of course they have done every little trick to the suspension possible. The big thing is the type of tire. Run something sticky like a drag radial and you'll be surprised how well it hooks. A slick is even better.