According to a BMW tech friend of mine, R134a is the "part" number for the type of refrigerant that Dupont makes. It doesn't mean anything more than that. 
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I USED TO HAVE an 85 Camaro 305 4bbl, 90 Firebird V6, 97 Firebird V6 (10 speakers!). Despite the two family vehicles, 3 kids, wife and mortgage, I can finally realize the dream - 88 TA almost all stock... for now.
http://www.cardomain.com/id/untameddave
Wanted this -  , but ended up with this -  for free. Can't argue with free.
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