Flowmaster FlowFX Cat-Back Exhaust System, Dual Exit, Rear Exit
Fits 2019-2026 5.3L V8
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Price tracked 10 times since Jul 30, 2026: low $949.95, high $949.95, currently $949.95.
where to buy · 3 retailers tracked
A cat-back exhaust swaps the factory pipes, muffler and tips behind the catalytic converter for less restrictive tubing. This is Flowmaster's FlowFX system in a dual rear-exit layout, with both tailpipes exiting behind the rear wheels.
why this one — Cheapest cat-back here at $949.95 and the only one claiming a double-digit gain at both ends, +21 hp and +26 lb-ft. That figure is Flowmaster's own published number rather than an independent test, and it was found on a reseller listing instead of Flowmaster's page, so read it as a best case and not what your truck will make.
CLAIMED - Flowmaster's own published spec (mirrored on RedLine360's listing for PN 717894) states "Maximum dyno gains of 21 hp and 26 lb-ft at the rear wheels." Not stated on the AmericanTrucks page itself, sourced via RedLine360 mirror of manufacturer copy.
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Gain shown is a manufacturer claim, not a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See our affiliate disclosure.