Hi Noel,

We're not quite sure what you mean. If you are thinking of replacing the automatic gearbox with a manual gearbox in the same car, we'd urge you not to do that, as the work involved would be very expensive. It would be far better just to trade-in your existing car against a manual one. Assuming that's what you meant in the first place, it's highly likely that you would have to pay for this transaction, as car dealers will want to make money out of it, even if your car is theoretically worth a little more than a manual equivalent. 

Best bet is to find a few manual cars you like the look of and ask the sellers about it.