Originally Posted by mikeo
Recent BMWs with spoilers/gurney flaps have used double sided body tape for mounting. Use a good strength nylon fishing line and work it under the OE spoiler and gradually 'cut' it off. Remove any remaining adhesive with Goo-Be-Gone or similar paint friendly product. Carefully align the new spoiler and install.
using a hairdryer to heat the glue will make it easier to cut through and get off.