My motor grenaded.

Nissan370

One of the first things that should be done to any motor getting worked on is having the motors health checked. Some shops do it some dont.

Second I feel you on the f $ ck factor when I had my motor pop doing a Retune when I had the Stillen kit but like I found out its hard to prove it was the shop or the motor.
unless the motor had a complete check up before the work was done

we all know once you start modding your car your kinda out there on your own.
And I don't know a dealer in the world that would replace your motor
for free after you install a kit on it.

Crazy thing when my motor popped I was at Burger King waiting for the car to be tuned and was called with the motor just let go and you ccan't drive the car. I was so angry it's not even funny.

As a price check it about 5k-6k for a replace motor and it cost me 8200.00 to have my motor built.

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370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)