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Almost forgot. You mentioned the EGR system. Please note IF it plugs into the exhaust for final waste removal, and you muffler has a catalytic converter in it (usually obvious from having weird heat shielding plates on the exhaust) DO NOT bypass it. Bypassing it will NOT give you more power! The Cat needs air to fully work, and that is what the piping provides. If bypassed the Cat will actually RESTRICT flow and act like the exhaust is clogged, making top end mushy and weak. Some EGR valves just dump back into the airbox. I have also seen some that dump into a "catch hose" that needs to be drained every now and then. Just know what you have first if you plan on bypassing it.
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