Bret is on the money about the cost. Even a new hood is cheaper than a C/F one. Then with the C/F one, you have to be careful about the paint or the clear, you need a hood prop and cannot use the shocks to keep it up, and hopefully the fit and finish is good.

There has been talk about installing an e34 c/f hood and even group buys, but for some reason, not many e34s have them...if they even do. That is for a reason. No good companies have taken the task of making an e34 hood and those that have have charged large amounts of money. I remember of one M5 that has it, but he is in europe.

If you are talking about cost, then go with the stock one. You have to also factor in problems later that you will have to pay for any corrections a c/f hood may need.