Built for Power & Precision

Let’s cut to the chase, because this definitely isn’t your grandma’s set of rusty old manifolds. The HDR Sequential 8-1 Headers from Stainless Headers are a next-level, hand-crafted performance weapon for big-inch V-8s — purpose-built for jet boat and high-output marine applications — and they were one of the most talked-about exhaust systems as seen at PRI 2025.

These headers don’t just look wild on the show floor. They represent years of refinement, real-world testing, and hardcore fabrication experience from one of the most respected names in the space.

What They Are

These aren’t just headers — they’re a race-inspired, sequential 8-into-1 exhaust system designed and hand-crafted by Dana Harp of HDR Industries, now partnered with Stainless Headers to deliver a more accessible, standardized solution without losing the custom edge.

Dana Harp has made these systems famous over years of building exotic, high-end jet boat exhausts, and this collaboration brings that same DNA to builders who want something beyond off-the-shelf. Available for Big Block Chevy and Gen III/IV LS platforms, these headers deliver bespoke performance plumbing that’s as functional as it is aggressive.

Engineered for Maximum Flow

Forget cookie-cutter designs. The 8-1 configuration merges all eight exhaust runners into a single, unified path, a layout that serious racers and fabricators obsess over for its potential to balance exhaust pulses and maximize flow.

This isn’t theory-only engineering — it’s the kind of design that gives high-RPM engines room to breathe and torque that pulls hard through the powerband. Traditional systems split things up with 4-2-1 or 4-1 layouts. Eight into one is a different level entirely — rare, purposeful, and unapologetically performance-driven.

Premium Build Quality

HDR doesn’t cut corners, and it shows in every detail:

• 304 stainless steel construction with purge TIG welds for strength, durability, and corrosion resistance — ideal for harsh marine environments
• Heavy-duty 3/8-inch header flanges for rock-solid sealing and long-term reliability
• Optional finishes, including ceramic coating, mirror polishing, and custom tip work, allowing you to tailor both performance and presentation

These headers are built to survive real use, not just win points at a car show.

Built for Your Build

One of the biggest differentiators? These headers are built to order. You’re not settling for a one-size-fits-all solution — you’re working from a proven HDR design that can be fully customized to your exact needs.

Tube sizing, collector configuration, port options, O2 bungs, water injection fittings, and custom tip layouts are all on the table. The Stainless Headers partnership makes the process smoother, while HDR Industries ensures the craftsmanship stays exactly where it should be.

Real Talk: Who These Are For

If you’re chasing maximum exhaust scavenging, serious mid-to-top-end power, and a custom-fabricated look that instantly separates your build from the crowd, this is your move. High-end jet boats, extreme marine builds, race-focused engines, or wild custom applications — the HDR Sequential 8-1 Headers deliver both performance and presence.

This isn’t just an exhaust system — it’s a statement piece, equal parts engineering art and horsepower liberator. If peak flow, exclusivity, and real craftsmanship matter, this is how you do it.

CLICK HERE TO LEARN MORE and get yours TODAY!