Quote Originally Posted by Cool Cat Racing
Actually the gas guzzler tax is not there for non emissions compliant cars, its for cars that don't meet the federal mileage standard. That's why its calleda gas guzzler tax. The trucks used the same KA that the 240's used, only the pulsars had a CA in them but the turbo version was never certified. Nissan didn't think the US people would pay the extra money for the SR powered cars so they never went through the trouble of making it work. As for using a test pipe, just gut the cat. Nearly equal flow and will pass a visual inspection.
It was also feared that it would interfer with the already fragile market of the 300zx.