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8374 to 7163 is a big jump. my twinscroll 8374 spools identically to a singlescroll gt3076R, and while that is incredible and allows me 700+hp worth of airflow, ~500 on the top end but spooling 1000+rpm earlier is very hard to argue with... plus it will roast all (4) tires more easily. Im not into highway or drag racing anymore and really just want my evo to have a "response monster" type powerband. the chassis and differentials are sorted and it slides very predictably so i look at this as a powerband that's more fun. I think these guys putting big singlescroll turbos on their evo's are nuts 6466, 6766, hta37, etc for dyno # and drag racing gets old to me
aluminum CHRA is only for the 7163 at this time. We are still hearing from many installers who can not or dont want to connect water lines -- the steel center section is crucial for these installs (obviously the alu needs to be watercooled). Ive requested that they extend the alu option to the largest/heaviest EFR first (9180 and 8374) and we expect that option to become available around SEMA later this year
as for the larger dia MFT rotor option on a B2 EFR turbo, its been discussed. Based on the results we're having with the 7163 we know there is potential for something like that, but in the lab it appears the 7163 is sort of a "sweet spot" for that blade design. There is some interest amongst the team to try out a couple other technologies, but the existing B2 turbos perform *so well* in the lab its pretty hard to top right now, so it remains to be seen what will eventually get approved and make it to market. More than likely it will be 2 years away... the good news is these guys are working on EFR stuff for 8-10 years from now already too, they are committed for the long haul
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