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I think the standard GSR exhaust on a VII is 2.25" all the way through (sure someone will correct me if im wrong) You would be better off running 3" all the way through :thumbup:

Just had a quick search through the forum and looks like a standard 7 will peak at around 1.2/1.25bar midrange and should hold 1.0bar at 7k.

Hope that helps, have a quick search if your unsure - tons of information.

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