4.10 a lb here . 12s without some help are far fetched hopes. Stall, gears, longtubes, and a 150 shot might get you there. I'd ditch the tb spacer and atleast get a nossle in the intake. Give you a little
Safety. These guys make nitrous sound so bad. I ran it for years and was happy. The failures I had where my fault not the nitrous or kit. I run boost now and make more power than I ever have. But the bottle was more fun to me. Each to his own