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sixto,
I'm not 100% sure, but I believe the later 603's did not have a boost control valve - meaning the boost is totally controlled by the turbo wastegate. And I don't think the I had any special electronic controls either. I'll have to take a peek at my 3.5L Intro manual tonight and see if I can find anything in there. The 1990-up 602's definitely have more junk, and the engine manual details the extra parts. I don't recall seeing anything like that for the 603.97x...??
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