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With that shop-manual it should be pretty simple. Count on about 2.5 hours to remove and 5.0 hours to re-install your first time around. The day before, soak all the exhaust crossover pipe nuts & bolts with penetrating oil and let sit overnight. That's really the only difficult part, removing those darn #$!@!@ exhaust bolts!
Actually Garrity has temporary stop doing work on Porsche's. From what I have heard he was swamped with work and gotten burnt out. Here's is email address: garrity928@primary.net