Description
655Z-31T D&D 2-into-1 Diablo Gato Black for 2017-2025 Harley FLH/FLT Touring Models
Check out our video on the Diablo Gato “Devil Cat” D&D Exhaust System. This is on our 2014 Street Glide.
Turn your Milwaukee-Eight Touring bike into a torque monster with the D&D 655Z-31T Diablo Gato 2-Into-1 Exhaust. If you want real performance gains instead of just more noise, this system delivers.
Built by D&D Performance Exhaust, the Diablo Gato was designed specifically for 2017–2025 Harley-Davidson FLH and FLT Touring models with the Milwaukee-Eight engine. Because these bikes are heavy and built for long miles, they respond best to strong mid-range torque. That’s exactly where this exhaust shines.
The 1-7/8″ stepped headers transition into a larger collector before flowing into the performance-tuned muffler. As a result, exhaust velocity stays high and throttle response feels sharper. When you roll into the throttle, you’ll feel the difference immediately. In addition, the stepped design improves scavenging, which helps build usable horsepower — not just top-end numbers.
If you’re running a cam, intake, or tuner, this system responds even better. Once properly tuned, the bike pulls harder through the mid-range and feels stronger on highway passes. Even on a mostly stock setup, you’ll notice smoother acceleration and improved ride feel.
The sound is exactly what a Touring performance bike should have. At idle, it has a deep, confident rumble. Then, as RPM climbs, it turns aggressive without becoming painfully raspy. So you get authority without sacrificing long-distance comfort.
Because durability matters, D&D built this system with precision-welded construction and heavy-duty mounting hardware. Touring bikes rack up serious miles, so this exhaust is designed to handle heat cycles and vibration without issue.
🔧 Key Features & Benefits
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True 2-into-1 performance exhaust design
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Stepped 1-7/8″ headers for improved scavenging
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Stronger low-end torque and mid-range horsepower
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Deep, aggressive M8 Touring sound
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12mm & 18mm O2 sensor ports for tuning flexibility
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Compatible with popular tuner systems
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Durable welded construction for long-haul reliability
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Designed specifically for 2017–2025 Harley Touring models
If you’re serious about performance, this isn’t just an exhaust swap. Instead, it’s a power upgrade that transforms how your Milwaukee-Eight Touring bike rides.
Cycle Solutions Performance Tip: Pair it with a high-flow intake and proper tuning. When combined, these upgrades unlock the full potential of your M8 and truly help you keep Making Hawgs Fly.
