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The jump from a 50-trim T04E compressor wheel to a 60-trim T04E isn't that huge. Most guys step up to a 60-1 from the 50-trim. The T04E 50-trim actually flows more than a T04E 54-trim and flow similar to a T04E 57-trim, but it's more effiecient at high high boost levels than any of the wheels in the T04E family due partially to the exducer size of the 50-trim being slightly larger than the 46, 54, 57, and 60-trims. The 60-trim is rated to flow a little more than the 50-trim, but it might not be as efficient at 30psi from looking at it's compressor map. However it looks like part of the T04E 60-trim's comp map might be missing on the ones publicly available. The 60-trim should make a little more power though just because it can flow more air, a couple points of efficiency doesn't have a huge effect on power overall.
People have run 10s on 20Gs and 50-trims, people have run 14s on 60-1s, you have to have the rest of the setup and tuning to make full use of any large turbo. If you go bigger than a 50-trim, you are probably going to want to get your setup capable of reving to 8000 or 8500 and making power up there so that lag becomes less of an issue.
If you want a T04E 60-trim, we can get you one at the same price. I only listed what I thought would be the 3 most popular sizes.
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