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you're right; with a plenum that exits straight out from the intake i'll have to put in a larger radius curve further upstream as the intake runners themselves are canted to the left a bit. i'm just thinking that the further i put that from the 90 degree bend that happens at the actual plenum the better. the thought of the cayman plenum is attractive, however, as the resonsnace flap used on that plenum is now used on the dfi 911's also, so it must work (i think it is a low end/top end compromise, l however). further, as you note, it should be plug and play with a 987 airbox (which is a way better unit that the 986). i have a line on a cayman plenum if you are interested; pm me for details.
regarding the dme adapting to the larger maf housing i agree, BR has gobs more experence than most of the rest of us combined and says it works. he said in a different thread that he's going to try it on one of his cars and see if the air/fuel ratios adapt. i know i have read of people doing 3.4 swaps and not having the maf appropriate to their dme and having problems, so definitive results would be nice. it may be an issue of cumulative change, also; the dme can adapt to the maf change, and the dme can adapt to a higher flow intake, but both a higher flow intake (and exhaust, etc.) combined with the maf change change may exceed the learning capacity of the dme.
i'll tell you what: you do the cayman change, i'll do the 997 change, and we'll meet in the middle and compare (manitoba - geographic centre of canada - gimli motorsports park)!
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