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There's always that theory that you can save time by not removing the headers from the car. You can try to get the cooler housing out of the engine compartment, possibly damaging the cooler element, etc. Maybe the shop guys can do this, but for the avg DIY guy, it pays to take your time and do it right.
I did my oil cooler over the recent memorial day weekend. I ended up removing the entire exhaust assembly (only 6 bolts, the O2 sensor and CO test pipe) before removing the headers. Headers come off easily. And, you can get at the oil pressure sender from above with a normal 24mm wrench with the headers off. Oh yeah, with the headers off, you can easily move the new, clean, beautifully restored oil cooler assembly back into place.
After 10+ years of working on my 944 (and my BMW 325), I found that taking your time, having the right tools and reading the procedures are key to having a good experience.
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