Advanced Fuel Dynamics ProFlex DXI Adaptive Flex Fuel System (5.3L)
Fits 2020-2025 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 9 times since Jul 28, 2026: low $799, high $799, currently $799.
where to buy · 2 retailers tracked
This is a flex fuel conversion kit. It adds an ethanol content sensor to the fuel line and a controller that plugs into the factory harness, so the truck reads how much ethanol is in the tank and adjusts fueling on its own. That lets you run E85, gasoline, or any mix of the two.
why this one — No tune, no injector swap and no pump swap, and the module stays invisible to scan tools, so this is the simplest way onto E85. The retailer listing for this part claims 40 to 45 wheel horsepower on E85. The catch is obvious: you get nothing out of it unless E85 is actually sold where you live.
TRE Performance's listing for this exact SKU (PFD-GM53DXI) states "Customers can expect 40-45WHP gains on E85." AFD's own product page does not give a numeric figure - only states "significant gains in horsepower and torque when running e85," referencing a separate dyno-data section not included in fetched content.
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 our affiliate disclosure.