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That would be one expensive comparo... All of us can really only speak from experience on what we have. Me. I have a 3inch Redback system with hi flow cat and no muffler. Goes great and isn't loud but has a good note. For a 3ltr. Don't spend big dollars. Thats all I can say. and make sure the cat is metallic, not ceramic. They handle the heat better and flow better at high temps.