Would a 2.0 even need a valve?Yeah on normal mode the valve will be closed. Turning on sport mode will open up the valve and will make the car have a few subtle pops.
It's based off the 3.0 so they use the same parts.Would a 2.0 even need a valve?
It should work. For normal mode and even cold starts in sport mode. If you have a JB4 it'll change when the valve works i think. Lot of us just unplug it or use the bmw m performance plug to have it always open.