I just built a L92 w/ LSA supercharger. What wiring are you using, the GMPP LSA one? My answers are using that assumption.
1. You'll need to add knock sensors and another intake sensor on the SC snout if I recall. Everything else should come w/ the harness or on the SC lid.
2. Why can't you use those? They're still accessible, I used them and many others do as well, you can even modify a stock ls3 vent to fit under the SC (just mount it first!).
3. Not sure of your combo, but I was told mine could be fired (l92, LSA, ID 850's, BTR PD stg II cam).
4. Yes.
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