The newer Spec II is among the most popular EBC(electronic boost controllers) out there. I have the Spec 2, and it works really well. Good solenoid, IMHO very reliable. The Blitz will give you more options/functionality--but you'll pay for that in price. IMHO--The Spec II is great for most Z'ers. That being said--if I found a good deal on the New Greddy Color Profec--I'd upgrade.
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