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1. Yes, anything is possible but it would invlove changing out a lot of components to do it right. It is not simply an "extra" added to a normal CIS system. You'd want to get a parts CD and compare what your car has with what parts are on the car you are trying to emulate, to get an idea of what parts to change. There were many, many little differences in the CIS cars from year to year and market to market. I would suggest sticking to a combination of parts that Porsche engineered to work together. Sort of pointless, if you ask me.
2. The frequency valve is located near the fuel distributor. It is a black cylindrical thing with a silver band in the middle and has a steel fuel line going in one end and a rubber hose at the other. There is also an electrical connector attached at an angle to the top, much like a cold start injector. When you disconnect the O2 sensor, the frequency valve is still in use. The control module sends a fixed duty cyle to it. So no, you shouldn't just yank it out.
If you run without an O2 sensor, make sure that you have your CO set properly.
JR
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We need not be gracious when our enemy dies. Civility is only afforded those who don't go to their grave trying to destroy us and ours. E. M. Burlingame
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