97 LS New tires! Need some help.
 

So I blew a tire out doing some... rally racin' on my friends 5 mile long driveway. Figured it's time to replace the 6-7 year old Toyo's on there. There's still tread on them amazingly... but they're old and the NW caught up with them.

ANYWAYS! My question is, What's the biggest tire size I can put on the 15" wheels without modifications/lifts ect.... Looking to fill the huge voids of wheel wells It has. The current tires are the "recommended size" 265/70/15. I feel like I can go a bit bigger?

Any help would be much appreciated. :)

tirerack.com