What do I mean by that? Many people have the misconception that if you increase the size of the engine you must also increase the carburetion. Not so. Think about the example of the Chevy V8. The 265 comes with a 2 barrel Rochester as does the 283, 302, 327, and 350 engines. Obviously, if you want to extend the RPM range of the engine you would add a 4 barrel.
Likewise with the VW engine. Because of the smog laws we, and many customers, have run up to 2200cc engines with the stock carb that have been running for well over 90,000 trouble free miles. It is critical with this carb to correct the compression ratio to properly match the octane of the fuel and the stock camshaft so the engine will work and live.
The engine will provide tremendous torque (pulling power) up to the point that the stock carb stops it from pulling any farther. This gives the illusion that the engine is short on HP as it gets to the maximum RPM extremely fast. The carb will actually be somewhat like a governor at the top end.