So I found this add on craigslist.
Stage 1.5 gtm procharger kit for 370z or g37
(Description)
For sale I have a used gtm stage 1.5 supercharger kit with everything minus the injectors. The kit itself has 12k miles on it and will easily make 500hp on 8psi. This kit is for a 370z or a g37 asking 3000$ obo, this kit goes for 7000$ brand new. Any questions just shoot me a text any time
I contacted the seller and he said his friends motor threw a rod and he is selling it.
I am not sure if I am ready to gamble with a used bolt-ons like this. I dont have a technical experience for buying used FI. I think I will keep saving for a new kit with a warranty. But the price isnt bad for somebody who knows what they are doing.