will these tires on this rim setup work on IS250? without mod? if with mods...what is needed? These are the tires that came with the rims.
245/35/20
275/30/20
20x9 +38
20x10.5 +45

 

Sounds like you bought vossens off someone who had a GS. Stock height you will rub upfront turning, try 235/30/20, that size for some reason is expensive, you might be motivated to pay for the 35 series which is cheaper but you will rub, take it from psonal experience.

 

tried rims from my cousins car 235/40/19 (Front) on my IS350 and when i turned it rubbed. and if you are putting 20's youre going to have to lower your car aswell to give it that slick look.

 

i actually did purchase a set of vossens from a guy with the gs. my car is lowered with eibach pro kit. You think i will be able to drive on it right now?

 

Will i need a fender roll?

 

I think you might, I wasn't dropped at the time but thinking back on how much space there was your current tires might be too much. Pulling off dropped on twenties on the 2IS has been done by some here, however I hear it's not easy, more reason to try and do it.