pcm all the way. the jet knob wont do anything for shifts and speed govs and the most important thing... they dont have experience tuning these cars. dhp/zzp/wbs/intense all have plenty of experience from trial and error for what works and what doesnt.
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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