Right now I'm driving with P215/65R15. I'd like to keep these size tires or close to them for the front, but for the back i'd like to get wider tires, possibly slightly larger, to at least get the effect that I'm driving around with bigger back tires. I don't know what size or brand I should be looking for though with the 15 inch firebird rims that I have.

 

With the15 in rims I would try Yokahoma, Falken or Kuhmo.

 

I am swearing by the Yokohama Decibals, those japs make some sticky tires.