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couple of things to watch for: 1) if you have too much egr gas go into your cylinders you can create dead spots in the combustion chambers which will cause raw fuel to go to your catalitic converter. 2)if you have one that sticks wide open when you hit idle you will be lucky to keep the engine running. 3) now for a possible retro part--older gm cars(pre-odbII cars) had vacuum controlled egr valves, i am thinking that you could control that style valve pretty easily. the problem would be porting into your intake, the gases going in are kind of hot, especially if you have a composit intake, GM ran a coolant line by where the gases came into the 3.8L engines. another thing to watch for is that you want the gasses to come into the intake as close to the throttle plate as you can as the need to mix well so they all don't go into just one cylinder causing a mis-fire.
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