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Evo X has 12T turbine housing vs. the 10.5T turbine housing of the 8/9
Evo X has a 15G compressor wheel vs. the 16G compressor wheel of the 8/9.[/align]
Bigger housing smaller wheel. It might not spool to much quicker because what you gain in one end it was given up in the other. the turbo is prob capible of more than a IX turbo im guessing though. and with a simple wheel upgrade it will prob make huge numbers on a stock turbo