ok. *cracks fingers*
Basically..
you're talking about two different beasts.. piggy back and stand alone.
stand alone = complete hardware upgrades like the lex honeycomb housing and injectors.. piggyback would be electronic tuning such as installing the honeycomb then adjusting using a wideband and a safc or something else.
adjusting that screw is not a method of fine tuning.. saying your checking your afr by how your engine responses and if you have a check engine light. Could possible be causing untold damage to your engine. My suggestion is to STOP. Do it right or your looking at an expensive repair. like a new engine due to detonation. These are not opinions..
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