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4" cat-back on a 2022 6.7 PSD. Hauls a 38-foot fifth wheel three states over and the welds look identical to install day. Drone-free at 75 mph. That's the hard part.
Mandrel-bent T304 stainless cat-back, axle-back and downpipe-back exhaust systems for diesel and performance platforms. Dyno-tuned. Lifetime weld warranty. Cut, bent and welded by hand in Ohio.
Cat-back to header-back. Each system is designed end-to-end — flange to tip — to bolt up clean and sound right. No mismatched gauges, no ill-fitting flanges, no second-guess welds.
From the catalyst flange aft. Replaces the boring stock muffler chain with mandrel-bent 3"–5" stainless and your choice of tip, tone and tail-out routing.
Rear-axle aft. The fastest sound upgrade — drop the muffler section and tail-out, keep the rest of the OEM mid-pipe and resonator.
From the turbo elbow aft — the diesel builder's choice. Frees the turbo to spool, drops EGTs, and pairs with our deletes and tunes for a complete top-to-tail upgrade.
Long-tube headers for V8 gas and big-block diesel race builds. Tig-welded primaries, individual port-matched flanges, ceramic coating standard.
Spec sheet. No marketing words. Pick the grade that matches how you use the truck — daily driver, dyno-day weekend, or a rig that lives in road salt half the year.
| Grade | Use Case | Wall Gauge | Welds | Salt-Belt OK | Warranty |
|---|---|---|---|---|---|
| T304 SS // flagship |
Daily, towing, performance | .065" | TIG · back-purged | Yes | Lifetime |
| T409 SS // budget |
Off-road / closed-course | .060" | MIG · sealed | Limited | 5-year |
| Aluminized // economy |
Race-only / disposable | .055" | MIG · single-pass | No | 2-year |
| Titanium // race spec |
Track / weight-savings | .050" | TIG · purged · X-rayed | Yes | Lifetime |
Every system gets sound-tested at idle, cruise, and 3500 RPM with a calibrated Class-2 SPL meter at 20" off the tip. No subjective "throaty" descriptions — actual decibels.
Truck on the chassis dyno, in third gear, full sweep from idle through 3500 RPM. SPL meter mounted at 20" perpendicular to the tip, ambient noise floor below 45 dB. Three pulls, averaged. Hot.
Every system is built by hand in our Ohio shop. No farmed-out tubes from overseas, no robot-welder-only assembly. The same techs that bend the pipe sign the box.
Every bend is mandrel-formed — the inner diameter stays consistent, no kinks, no flow-killing ovals like cheap crush-bent pipe.
T304 weld joints are TIG-welded under back-purged argon — sugaring on the inner weld bead is eliminated. Welds last because they don't corrode from the inside out.
Every assembled system is leak-tested at 12 PSI before it ships. Soap-bath verified, signed off, boxed. If a joint weeps in the field, replacement is free.
Every pipe is bent, every flange is laser-cut, every weld is laid right here. We don't private-label overseas tubes and badge them ours. You see the techs in the install videos — that's because they built your kit.
Cab-and-chassis fleet operators, sled pullers, daily commuters, weekend track warriors. The kits hold up because the people who built them have to drive past the customer the next morning.
4" cat-back on a 2022 6.7 PSD. Hauls a 38-foot fifth wheel three states over and the welds look identical to install day. Drone-free at 75 mph. That's the hard part.
I've put 60+ of their cat-backs on customer LBZs and L5Ps. Zero warranty claims, zero leaky flanges. The TIG welds make my MIG-welded competitors look amateur.
Race-headers on the LS swap. Coating still flawless after a full sled-pull season at 1500°F EGTs. Dropped 22 lbs versus the cast manifolds. Worth every penny.
Straight answers. If yours isn't here, the tech-support line is the same number we've used since 2009.
Year, make, engine, transmission. We'll match the right pipe diameter, tip, and tone for how you use the truck — and ship it from Ohio inside 48 hours.