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Message: <blockquote data-quote="Paul" data-source="post: 938192" data-attributes="member: 9404">There is almost no way you'll get the 408 to pass the sniffer. I tried and tried and tried and tried to get my 418 to pass emissions with a very small cam, mild heads and intake, and extensive tuning via an AEM EMS with dual widebands running speed density. By running 50% alcohol in the tank, shutting injectors off, running the motor ULTRA lean to the point where it would barely stay running at all, and more, it could get it to pass two out of three components of the nest a time. (CO, HC, or NOX) However, when I would adjust the tune, for example, to pass NOX, I'd fail HC. Adjust to get HC in the clear, and fail NOX.Remember, it's just simple numbers physics here. You're trying to get a motor that is 40% larger than a 302 to pass on 302 standards.I don't recommend it. Put an emissions-legal blower on your 302.Paul.</blockquote>