Hey, In my experience with cars you would be fine to take it to one of our Maxsponsor' shops. Is the car just a stock Infinti? If it is a heavily modified car then I might venture to say take it a specialist for those vehicles, otherwise I would say call Bimmersport Automotive and ask for an appointment to have a used vehicle PPI done. This will tell you the general condition of the car, what it may need for a safety (if it is being sold uncertified) and you can get the opinion of a licensed mechanic. Their shop is also located right around where it seems you would like to go. Mind you this referral is also because you said anyone who can do this sort of thing would suffice. If someone chimes in with a recommendation for a Nissan/Infiniti specializing shop that would obviously be something you might consider.
Best of luck to you and your sister.
Last edited by ///M-TRD3; 04-13-2009 at 05:22 PM.