SPD Performance Off-Road Axle Dump Dual Exit Cat-Back
Fits 2011-2014 3.5L EcoBoost
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Price tracked 12 times since Jul 30, 2026 across the stores we check daily: low $685, high $750, currently $685.
where to buy · 3 retailers tracked
A cat-back exhaust replaces everything from the catalytic converter back to the tips. It changes sound and sheds a little weight - it is not a serious power mod on its own.
why this one — The axle-dump design exits the exhaust in front of the rear axle instead of routing all the way to the back bumper, giving a louder, more unfiltered sound - mainly popular for off-road/trail trucks. SPD does not publish a power figure.
No manufacturer or independent dyno figure found for this specific product. Cat-backs on turbo trucks with a downpipe/tune doing the real work typically carry no standalone gain claim; sound/tone is the primary value prop.
Estimated from comparable claims: MBRP ~+5 whp; Corsa +12; Flowmaster 11; Flowmaster 18
Questions about this category
No published gain figure for this part, and nothing here is 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.