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I ordered the greddy TZ518z without seeing any real world proof of its power. If anyone that has seen this turbo in action or heard about it, pls respond. I will not be putting it into my WRX for another month or so until i am able to upgrade my injectors and fuel pump. I will be running the UTEC with a XS engineering cold air intake, and greddy FMIC. So as soon as the few remaining mods come in im installing it all in at one shot. Let me know what you have seen or heard about the greddy turbo upgrade. Thanks!