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At full price I will also include the HP Tuners device that I purchased to tune the car. The unit still has 6 remaining GM credits as well. That’s worth about 500$ by itself.
Yes. Via wide band oxygen sensor installed in a bung on the X pipe. I also have the wide band PLX hardware and digital Air / fuel gauge that goes with it for tuning.
I never installed it permanently because I didn’t want to change the interior in any way. Someone else could if they wanted to.