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06. After adding a dab of Teflon(R) thread sealant, carefully install the special fuel filter that bolts directly to the NOS fuel solenoid. Be sure to snug up the filter with a wrench, but don't overtighten the unit, or the tiny threads will probably strip. The extra fuel filter keeps the fuel portion of the nitrous system from getting clogged, which would cause a lean condition that can destroy an engine.