I just did this last week, like Lowski my fight was with the spring clip. I as able to get the tube on with the manifold bolted down, working from the engine side by feel only.
You might try unbolting the manifold and pulling into the trunk enough that you can see if there is something in the way. Perhaps the edge of the tube is bent over?. Heat is also an alternative... that was the only way I was able to get the rubber intake tube onto the throttle body when I swapped my engine.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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