I've read (from Bosio nozzle promotionals) that Bosch parts have varying QC. They make it to a minimum spec but it's still of varying QC.
Although diesel is not supported by the Chinese government as a "green" technology, Bosch is hoping to spread some of the joy Europeans have driving new-generation diesels there. The company has upgraded a facility in China to manufacture diesel common rail systems for use in passenger vehicles, starting next November. The facility is run by Bosch Automotive Diesel Systems, a Bosch subsidiary based in the eastern China city of Wuxi. The factory currently produces about 100,000 units per year, but this will be boosted to 1.4 million units by 2010. Bosch common rail technology is installed in most European diesel engines.