Help me select some tires whats the widest you think i can go without rubbing. Mods include oem front fenders flared shaved, and asm rear overfenders w/ quarter panels cut. Any advice is greatly appreciated.

Rim size is 18x8.5, 18x9.5 +44 all around.

 

I would run a 235/40 up front and 265/35 in the rear.

 

I would say that without any modification I would go with 215/40R18 and 245/35R18. A 265 is going to stick out and rub with a 44 mm offset.