4runner can't pretty much fit any size head unit.. kenwood's excelon head unit is best bang for ur buck and quality and they hav every type from low budget 2 high dollar set ups
if u got a 2wd then prob running 225.. u could go with 245 or 255 and it would b a large improvement and still won't affect anything that enough for u 2 notice
i love my bridgestone's and got bout the same deal when i bought mine.. i've had bfg's 2 but there's nothing special enough for me 2 wanna drop that much money on them again
the only thing that it will hurt is ur gas mileage.. 265 won't mess with ur speedometer reading.. 285 will start 2 throw it off a little.. so 2 sum up its not a bad idea @ all
u hav 2 get a plug and play for the hids and retrofitting projectors would look clearer.. for the custom grill u cut out the center and u could make it mesh or do the satoshi mod which looks really good
short of retrofitting prejectors there's not much u can do 2 the head lights themselves.. u could get clear corners and bumper lights.. somthin cool 2 do while its apart would b 2 customize the grill