To add to what Ground is saying, the S14/15 ECU only has one switch output/input on the ECU so you're stuck switching both cams at the same time. Now that isn't a huge disadvantage, but to get the most out of the system on a P11 head, you'd want to switch cams at separate times. The P12 head used one solenoid to switch both cams at the same time, but their cams have a completely different profile than the P11's.
Haltech has the ability to switch both cams separate from each other. I'm running a Ps2000 on my setup and plan to find the best combination for the switch point.
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