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I just did mine three weeks ago and its not for the faint of hear but next time around would be much more expedient if i had to do again... mine was functioning OK but looked original and I thought it would be best to replace for prevent main. purposes.
As mentioned above, worm clamp for new boot/ lower to motor is preferred. I tried the pre loaded porsche clamp but just couldn't quite get it to seat right. Boot was twisted and not completely sealed.
I cut original boot with a knife and cleaned up all debris and old oil around the boot. This made removal of AOS easy after all bolts and lines undone.
Toughest part is not being able to see and then wrench... with left rear wheel off you can see where the bolts are but you have to reach and go by feel with 1/4 inch ratchet... also you have to be very careful with AOS lines and other plastic lines around the TB. They are brittle with under hood heat and time... plan is to replace with proper silicone non collapsible hose and oil catch can down the line.
First time ever doing it was a little stressful and I am not sure a lift would have helped. I used a very good youtube video and some of the other tips here on the forum. Part was about $45 on amazon and it was a Porsche part but had the serial and part numbers filed off which I assume means new old stock. Fit and had exact same OEM fit and features.
Good luck and 400$ is not far off as labor around here in top german shops is 125 or more.
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