Description
D&D 634Z-32B Chrome Fat Cat 2-Into-1 Exhaust
For 2018-Newer Harley-Davidson® M8 Softail Models
If you want classic chrome styling with serious performance gains, the D&D 634Z-32B Chrome Fat Cat delivers. Designed specifically for Milwaukee-Eight Softails, this 2-into-1 system increases low-end torque while sharpening throttle response.
In addition, the bright chrome finish gives your bike a clean, aggressive look that stands out.
This system fits Softail models equipped with mid or forward controls, making it a versatile upgrade for many riders.
âś… Fits These 2018+ M8 Softail Models:
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Street Bob
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Low Rider
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Slim
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Fat Bob
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Deluxe
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Sport Glide
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Heritage Classic
However, this system does not fit Breakout or Fat Boy models. Instead, use D&D part number 638Z-32B for those bikes.
đź”§ Performance Features:
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Stepped headers: 1 3/4″ → 1 7/8″ → 2 1/8″
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2 1/2″ collector
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4″ muffler body
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Louvered baffle
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Back-cut tip
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High-quality chrome finish
Because of the stepped header design, exhaust scavenging improves significantly. As a result, riders experience stronger torque and noticeable horsepower gains.
📦 What’s Included:
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Complete exhaust system
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Heat shields
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Exhaust gaskets
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Mounting hardware
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Bolt kit
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Installed baffle
Therefore, you get everything needed for a straightforward installation.
⚙️ Tuning Compatibility
Additionally, this system includes both 18mm and 12mm O2 bungs. Because of this, it works seamlessly with wideband auto-tune modules like ThunderMax.
In short, the D&D 634Z-32B Chrome Fat Cat combines bold chrome styling with proven M8 performance gains — making your Softail run harder and sound better.







