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I think your shop is steering you in the right direction. All Boxsters from 00 on are E-gas but have different brains. IIRC 03-04 cars have the same DME electronics.
No idea about Tip cars vs. manual.
Also, I understand about wanting to save a buck but don't go with the 2.7. It'll be a bad story when you go to sell and will hurt resale a lot.
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