dont see why you wouldnt want to run premium? your spending HOW MUCH on performance mods and about $100 for a pcm but you cant afford $.10 more a gallon? i never understood this.... we have what a 16 gal tank even if it was 20! thats $2! TWO DOLLARS and you have spent how much on mods....
its the same thing with tires... so many people spend all this money on performance parts and still run around on a set of grandma all season economy tires.
as for the tuner.... yes he just needs the newest software version from DHP. but even with his old software, he can still scan your car.
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96 Z34 (3.4L DOHC RIP PB 14.81@92.2):
www.cardomain.com/id/z34phoenixL36 swap SD header, 2.5" exhaust, HV3, PowrTuner, Wideband, topswap w/ ported heads to be installed