Flowmaster FlowFX Cat-Back Exhaust System, Dual Exit, Rear Exit
Fits 2019-2026 5.3L V8
We earn a commission if you buy through links on this page. Prices are the same for you. Full disclosure
Price tracked 21 times since Jul 30, 2026 across the stores we check daily: low $921.95, high $949.95, currently $921.95.
where to buy · 4 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.
Questions about this category
Gain shown is a manufacturer claim, not a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See how we check a price and our affiliate disclosure.