I am trying to budget ahead on mods for the Challenger. I have been looking at purhcasing new wheels because the stock 18" rims just arent where its at. I found some Boss wheels on ebay for a decent price. It is $660 for 18x8s, or $775 for 20x8.5s. The main question I have is about the factory rim size and rear end gears. I know that manual challengers with 18" rims have 3.73s, and 20" rims have 3.92s. I have read this is due to the larger rotating mass and heaver weight of the 20" rims. How would going to 20's affect my car? I know tires would be a little cheaper for the 18s, but I know 20's will give me better cornering. Just looking to get your personal experience and any input. Thanks.