From my understanding , the turnkey you get everything you need to run the supercharger ..... But not the best supporting mods , fuel pump, inj ect and a base map ( which is pants ive read ) and then take it to a tuner to get properly mapped. With the tuner kit you only get the charger and pipe work ..... You will need to add all supporting mods ..... Which from my understanding is better as you can spec the fuel pump, inj , frs to a higher spec which will help the quality / performance/ reliability of the kit ...
350z HR version please