I did mine myself and did not damage the body at all. If you take it slow you won't have any problems. I have 295/35/18's and they stick out a tad. I do not think you will get 305's under the stock body. Why do you want 305's anyway? Tire choice (brands) will be very scarce and the price will be much higher than a 285 or 295. It's just not worth it IMO. I don't have any pics but the appearance of the car is not altered in any way. You have to look under the fender to see the modification. Hope this helps.