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Senior Tuner
It's a touchy subject so I'll confine my remarks to making the
car run as clean as it can.
One thing that will help is for the closed loop fueling to swing
tight and fast, not (as you often see with headers) bury low
and hang out, then slam high for a while, etc. Proportional
fueling and O2 sensor transport delays seem to drive this on
V8s, dunno about V6s.
For hydrocabon emissions you would want to run a clean oil
and roll in with a well warmed up car. Higher coolant temp
(within reason) tends to make for cleaner / more efficient
running so you might want to up the fan settings.
Presuming this is a sniffer and not just a "light check".