[Randy Rosenberg]

Once the Manx is legally titled in CA (using the VW VIN), then there's no need to change the title.

If you a building a "new" Manx from scratch, using no VW parts (ie: no VW VIN), then you would be building a "Specially Constructed Vehicle", eligible for SB100 Smog Exemption, based up on the year that body represents (just like a building a new Cobra Replica).