Super HP-2 Muffler 409SS - 2.50 Center In. /2.50 Center Out - Moderate Sound. Flowmaster has taken the laminar core of our classic HP-2 muffler and wrapped it in a new compact square case. These mufflers are available in either a 409S stainless steel case or a polishable 304S stainless steel case and in sizes ranging from 2.00 in., 2.25 in.
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