4.6L (1996-2004 Modular) MustangTechnical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within. Sponsored by Cruizin Concepts
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I have not done a before/after dyno for a tune and mid pipe but peak gains might not be more than 10 or 15 rwhp. You might feel a better pull throughout the rpm range though.
IIRC someone did a flow test on common mufflers and Flowmasters (I think they were the 40's?) were among the worst, but I doubt anyone could feel the difference between a chambered muffler like the Flowmasters and a straight through muffler.
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