It wasnt much price difference here between the 2 but the air gap does give you a little longer runner. As for passing an environmental test i would honestly have no idea. Im sure you could if you knew someone who could really tune a carb. But im not sure myself because we dont have any tests that cars have to pass and by the time they make it here my car wont need it because it is allready a classic. But i would definately just say tune the carb really well and make sure it is all running good.
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