I used TWM's on my engine. While the throttle bodies themselves aren't out of sight expensive, when you add throttle linkage, injectors, fuel system (pump, regulator, filters, hoses, fittings), and ECU, as others have said, it gets expensive quickly.
[ February 01, 2003: Message edited by: Dave Wharran ]

[ February 01, 2003: Message edited by: Dave Wharran ]