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If I was me with a 3400 V6 and I just had the stock manifolds (no headers) and I wanted the best exhaust I could get for N/A, I'd start right from the manifolds with 2.5" piping the whole way and make a new downpipe. Then from there add a high flow cat, 1 long straight through resonator, and a straight through muffler. This would give you the most unrestricted flow as well as maintain exhaust velocity to retain low end torque.
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