(reading the first post) twin turbos seem a little overkill, you can only force so much air into the motor, you might be better off with just a single turbo. twin turbos are only very effective on v8s or bigger engines....
Ever hear of the RB26DETT??? First engine to reach a kilowatt of power. And guess what it is? an inline 6! and whats the bore? 26mm? Should sound familiar to any slanter here.
Its a 3-1 setup. 3 cylinders per turbo. and im not mounting T4 style turbos, so no overkill here.
And if you know your s*** about turbos you should know a smaller engine responds BETTER to turbocharging. And that twin turbo eliminates lag as well as providing better exceleration response.
Also, this project is to do something different that hasnt been done before. Ive seen 70000000000000000000 TURBO SLANTS with epic turbo lag made up for by nitrous and running like 37 lbs of boost. But no twin-turbo slants. And I disgust NO2