my honda failed emisions w/ very high carbon monoxide levels and above normal hc and nox do i need a cat conv?
i have aftermarket exhaust from the headers down, w/ no catalytic converter, my numbers were carbon monoxide 34.55 and standards are 12.00. NOX were 3.11 where 2.0 is standard, and Hydro Carbons were 1.20 and standards are .80