Exhaust systems: sound first, power second
Be honest about why you are buying an exhaust system. On most trucks the power gain is modest; the change in character is immediate and is what you actually paid for.
Cat-back is the common choice: everything behind the catalytic converter, legal essentially everywhere, and the section that determines the note. Axle-back is shorter, cheaper and changes tone with little else. Header-back is the biggest job and the one with the most compliance implications. Straight-through mufflers are loudest, chambered are the most tolerable at cruise, and stainless costs more than aluminized because it is still there in six years.
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Drone, legality and towing
Drone is the resonance that arrives at exactly the highway speed you spend your life at, and it is the single most common regret with a loud system. Read what people say about the note at cruise, not at wide-open throttle.
Anything upstream of the catalytic converter has emissions consequences that vary by state. If you tow, a system that scavenges well at low rpm is worth more than one that sounds impressive empty. We stock 325 exhaust parts from 3 brands, matched to engine and model year.