Our custom S300 turbo's are not a 360 degree thrust bearing, we have hundreds out there now with no thrust problems. We do offer that option however for people who may need it, mainly in a compound set up. Turbo balancing is key to bearing life in a turbo, and Pius who builds these custom cartridge's for us may know a thing or two in this area

That being said we have extensively tested many turbo configurations on the 6.7, from compressor size/design, turbine sizes, and many different a/r ratio's. Testing has been done on the dyno with real world data logging equipment so we could gather every bit of information possible. (Compressor discharge temperatures vs, RPM, E.G.T differences, spool under load conditions, peak torque vs RPM, just to name a few). Then from there went to daily drive ability and towing. At the end of the day our goal was to achieve producing the highest quality system on the market with the best "real world" overall performance. A truck you could still have fun with, and you could use as it was meant to be used without having to think it was any different then stock. I just let my wife drive it if I need to know how close to stock style performance it is

The a/r number doesn't really help the end user in a real world scenario unless they may be building a custom compound set up, at which time there are a few more calculations that go into that. The end user should be able to call the manufacturer and tell them what they want out of the vehicle, with the manufacturer having done extensive testing on their product to recommend the best combination for them without just trying to make a sale. We do take pride in trying to have the best customer service in the industry as well as a quality product. Once again thanks to all who support us, and if you ever have any questions about trucks or products, please feel free to contact us