The modded LS manual. The manual has a 5 speed, while the auto not only shifts gears at 7000, or maybe 6800 or so, but has 4 speeds. If you raced those two cars, the LS Manual vs the LS Auto tranny, the manual would win because you would have the ability to go above redline. While the auto will shift at or below redline. But the automatic has a tiptronic, so you can shift gears manually, starting from 1, 2, 3, then D4.But hey, anything can happen. It depends on the driver if hes crappy or not. But if the drivers were equal in skill, the manual would win by a sec or sometihng like that.