Hi, I was just wondering I couldnt find anything searching, but if I have a CAI, and a freeflow exhaust system on a 1997 328is, what kind and type of injectors should I purchase?

Only the free-flow exhaust is going to have any affect on the mass flow through the engine, and its contribution is negligible. So the stock injectors are fine. You'd have to seriously affect the mass flow (cams, port and polish the heads, FI, etc) to justify a change from the OE injectors.

I have some serious misfire, and bad fuel consumption right now, and it may be because faulty injectors...what lbs are the OE ones?

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Unless one of the injectors, have completely taken a shit, I doubt the injectors are your problem. They can pretty much handle any bolt on modifications.

I have some serious misfire, and bad fuel consumption right now, and it may be because faulty injectors
While that could be caused by the injectors, the odds are that something else is wrong. There are a number of other possible causes and the best approach is probably to have the car professionally diagnosed.