k20z1 or a2

Wtb tapped pil pan shipped to 90631

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i initially thought the new 06-10 si had the z1 from the 05/06 type s. sorry for the newb question but what is the difference between them?any help would be much appreciated.

Cleaning out my garage to make space & found a bunch of un-needed stuff. Prices include Shipped & PayPal fees Located in Upstate, New York. (4) K20a2 Denso coils - $50 OEM K20z1 exhaust manifold w/ headshield - $40 K20z1/a2 "i-Vtec" intake manifold cover - $15 K20z1 power steering pump -...