>>I know of plenty of people that have gone from standard to short runner plenums on dets and gained nothing up top and lost a heep of midrange>>
exactly, the design of a good plenum does not only follow simpel rules, its a product of lots of experience and very often a product of complex simulation calculations.
One example is the original RWD greddy intake plenum in comparison to the ebay-copy. It looks really the same but works far worse.
here is my compressor map, i use the small GT2871 .64, this is one of the most harmonic 2 liter turbos, it runs well on audis, nissans, mitsus. 15psi@2800rpm on my DET!!!
TurboByGarrett.com - Catalog
>>Nah its not the same, He has very long bellmouths inside that plenum. Thats why the camber looks soo big.<<
Aaah, you are right, i can see it barely on one photo when the TB is held open. Wuuuh, i want that intake plenum...