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I believe its a 2.6.

You could go with an S464 and upgrade the compressor wheel in the future, I'm pretty sure the compressor cover on the s300's won't fit the s400's and there is no need to.

 

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I'm not sure about a different compressor cover, although I know its machined differently for the smaller 64mm wheel. The T4 S400's have a 4" v-band exhaust outlet instead of 5", I believe that's the only difference. The .90 and 1.0 ar exhaust housings are T4 and the 1.1 is T6.

The S464 flows quite a bit for a 2.5, something like 80lbs/min vs the IHI at 55lbs/min.