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I'm planning a 13bre install into a s4 fc. I will be running the stock twins until I can afford a proper turbo setup. I'm considering using a lt10 but I really don't know much about the different units and how they are superior to one another. I would like something with a 2 step but will try to get a bee r* unit if it's not an option. I don't mind spending a couple extra dollars if it gets me something a little better. can you explain a couple models and the differences between them.