I'd go to a local exhaust shop (NOT Meinieke, or the chain exhaust shops), and ask them. I had them build a custom 2.5 inch catback exhaust on my old 4Runner so that I could get decent torque out of the engine, but also had it set so that I didn't crush it offroading.
They charged about the same as buying just the exhaust system for both labor and parts. That's my preferred method.
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