Great little motor, I had one about 10 years ago on my RS4. and my girlfriend's RS4-2 currently has one. Claimed output was about .67 hp, super easy to tune and not too tempermental. It has plenty of power for a parking lot racer. It was a great club-level motor. At that time novarossi had a .12 side-exhaust that made 1hp.
im not sure how much the power the HPI 3.0 makes, but its probably more power than the .15 CV if that bothers you at all.