First of all, can you explain to us what "NOS" rings are?
Second, the VF-22 is a pretty big turbo. With your 1.8L engine, you may want to look into something just a little smaller, such as a Legacy RHB5 turbo. Both of these turbo's are made by IHI, though they are diffrent sizes. The VF-22 in your case will probably gause a significant amount of turbo lag, due to its large size. The Legacy RHB5 (VF-10) on the other hand will produce more boost down low and be more streetable, not to mention they can be had quite cheap as compared to the VF-22. Just to put it into context for you, the WRX guys running the VF-22's (remember this is a 2.0L engine, not a smaller 1.8L) don't see a whole lot of boost unitl about 3500-3700 RPM. Now, take this turbo and put it on the smaller 1.8L flowing less exhaust. My guess is you won't be seeing the boost you want until around 4000 RPM. Now, I am not you, and don't know what exactly you want to use it for, but the smaller turbo in your car will be more streetable, probably producing boost anywhere from 2500-3000 RPM.
Graham