Beautiful cars, its 3700-3800lbs for the S5, those tires (255/35R19) will be good till you get over 500 hp, might spin a bit at 550 hp unless you are running Pilot Sport 4S's or similar. The 207mm lower is a lot heavier and I feel like it affects how fast the car revs, limits going to more power later, and is much more likely to fail because it is so heavy. I don't really recommend them, but you will still be able to run low 7s in the 8th with the 207mm. I am running the 57 mm upper on E85 making 500hp and when I do the 194mm crank pulley I should be able to go higher than 550hp with none of the downsides of the 207mm, just my recommendation having used both setups. Great video.
