Quote Originally Posted by DennyW
Yes, that type air filter will help on the breathing. They are intended to draw more, for performance, rather than mileage. At a certain rpm range, the clean stock type filter will work fine, and allow free breathing. If you are running a carb, tune the mixture settings with the air filter installed. That way, you are tunning it the correct way for mileage.
its a fuel injected 4.3 vortec