The Series 1 (L27) had a Metal manifold for half a year (1992).
Series 1 (L27) had plastic manifold from 1992.5-1994 There aren't any common issues with this one
Series 2 (L36) had a plastic manifold from 95-Current, these are the bad ones.
Series 2 (L36) should be ok after 2000, supposedly the design was modified.
Series 3 (L26) has a Metal Upper manifold.
Series III is a direct bolt in, except for a throttle adaptor. The 00+ designs are just starting to come around to the milage where the originals would fail, so the metal one isn't a bad idea. It'* also much easier to modify for performance, since it'* metal and not a composite plastic.
'06 Vee Dub GTI 2 door Tornado Red
- 2.0 Turbocharged, Intercooled, Direct Injected, 6 Speed DSG, Underbody Aero, 17" Classix
- Moonroof, Bi-Xenon headlamps, Interlagos Plaid Sport Seats, 6 Disc In-dash, iPod integration, GTI Monster Mats (winter)
'93 Bonneville SE Purple Pearl H4U package - picked up June 23, 2003, Traded-in June 28, 2007...