Sinister Diesel Sinister Diesel SD-6.7PEX17-01-20 5 inch Exhaust Cat-Back System (409 Stainless Steel) | 2017-2023 Ford F250/F350 Super Duty 6.7L Powerstroke
Fits 2017-2023 6.7L Power Stroke V8 (2017 calibration) · 6.7L Power Stroke V8 (2018-2019 calibration) · 6.7L Power Stroke V8 (2020-2022 calibration) · 6.7L Power Stroke V8 (enhanced)
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A cat-back exhaust replaces the pipes and muffler from the catalytic converter to the tip. It changes how the truck sounds and drops a little weight. This one is the Sinister Diesel SD-6.7PEX17-01-20 5 inch Exhaust Cat-Back System (409 Stainless Steel) | 2017-2023 Ford F250/F350 Super Duty 6.7L Powerstroke, listed to fit the 2017-2023 Ford F-250/F-350 Super Duty. The listing describes it as bolt-on, stainless steel.
why this one — Cat-backs are a sound and looks upgrade first. Treat any power claim as unproven unless the maker publishes a dyno sheet. Alligator Performance lists it at $491.00, and the fitment above is what the listing itself states, not a guess.
No horsepower or torque figure published by Sinister Diesel for this part on the Alligator Performance listing, read 2026-09-04. Not estimated.
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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.