Before I had my biturbo my speedometer was broken, so I'm not sure how fast it went beforehand. I think mine averaged 30 before the biturbo, but that was being followed by a Blazer with a slow speedo. I've fixed my speedometer since then, and it has a little pin that limits it from registering above 30. But with the Biturbo, the needle is buried at full throttle on flat ground, and 3/4 throttle downhill.
P.S, the newport is the same as the 2 HP Maxi, just with pinstripes and a cooler tank decal :)