@catalyst, thanks for the response
ya unfortunately i looked on the hankook website and they said the ventus v12 225/40r18 was recommended to run on a minimum of 7.5 inch wheel width so i went with the 215/40r18. if i were to have just gone with the 215/45r18 would there have been a big performance difference? i know the speedo would have been more off but i could have lived with that, the car is a stock 5eat (just spt intake) so although i enjoy the performance i could take the hit. also would lowering the car help?