So i had issue with idling on 800rpms on my g37, and literally i came to them twice with stock air intake, and other time with aftermarket ones which is cost around 400$, cause they though its prob air leak, so they told me thats i need to change it back, but on the phone guy said it’s perfectly fine. At the end nothing was done, i spent 2 hr of waiting for nothing. After that i want to INFINITI-NISSAN body shop, guys there in 10 mins told me its prob with butterflies in intake, i bough a pair for 120$, instead my self for 1.30 hour, and finally my problem is gone. I spent almost 5 months to trying figure out whats its was. Just letting you guys know, i am never coming back for service, might be i am going to buy parts like brakes, plastic cover and etc,(part -service is really good tho) but i am never coming back for a service