Is engine tuning necessary to use high performance fuel?
Malaysian motor enthusiasts may help in this matter. Is engine tuning necessary to use Shell V-Power Racing in a particular car, ie Nissan 350Z, Honda Civic Type R, Mazda6 etc. & what is the octane rating (RON) number of this fuel?
HA! dont buy that crap, its a waste of money, unless your pumping 400+ hp on a civic or teg, or similar, for something like a 350 z you would have to have at least 600 hp to start using that kind of fuel.
its a waste of money, regular cars
Huntington 
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