5" Diesel Exhausts 409 STAINLESS5" Downpipe Back Exhaust System 409 Stainless Steel (Direct Fit) Built for Performance. Designed to Last. This 5 inch downpipe back exhaust system is the upgrade your diesel truck needs. Crafted from high quality T409 stainless steel, it's built to withstand the harshest conditions while delivering real performance gainsmore horsepower, lower EGTs, and better fuel economy. Whether you're after increased flow, reduced backpressure, or that deep,
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