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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.
You didn't read it in their promotion but I've read it on tdiclub. The idea is that the nozzles are cone shaped instead of a straight tube. But the Bosch nozzles are hydraulically rounded, they smooth out the edges of the nozzle so that it sprays better. I saw pics somewhere but you can imagine how a rough edge on the machining of the nozzle would make a bad spray.
 
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