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Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2″ head pipes, equal length tubes, and a larger collector, this exhaust is made specifically for Harley-Davidson’s Milwaukee-Eight™ engine. Includes 18mm and 12mm O2 sensor ports, all full coverage heat shields, clamps, bracket, and install hardware. MUST use Screamin’ Eagle Flat Gaskets to install properly (HD Part#17048-98).

The 1325XB Model Fits 2025-2026 Low Rider ST & Heritage ONLY.

Please order a 1363XB if you need one for 2018 – 2024.

Thunderheader™ X-SERIES™ M8 Softail 2-In-1 Exhaust – Black (25' - 26')

$1,839.00

Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2″ head pipes, equal length tubes, and a larger collector, this exhaust is made specifically for Harley-Davidson’s Milwaukee-Eight™ engine. Includes 18mm and 12mm O2 sensor ports, all full coverage heat shields, clamps, bracket, and install hardware. MUST use Screamin’ Eagle Flat Gaskets to install properly (HD Part#17048-98).

The 1325XB Model Fits 2025-2026 Low Rider ST & Heritage ONLY.

Please order a 1363XB if you need one for 2018 – 2024.
$1,839.00

Thunderheader™ X-SERIES™ M8 Softail 2-In-1 Exhaust – Black (25' - 26')

$1,839.00
Thunderheader™ X-SERIES™ M8 Softail 2-In-1 Exhaust – Black (25' - 26')

Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2″ head pipes, equal length tubes, and a larger collector, this exhaust is made specifically for Harley-Davidson’s Milwaukee-Eight™ engine. Includes 18mm and 12mm O2 sensor ports, all full coverage heat shields, clamps, bracket, and install hardware. MUST use Screamin’ Eagle Flat Gaskets to install properly (HD Part#17048-98).

The 1325XB Model Fits 2025-2026 Low Rider ST & Heritage ONLY.

Please order a 1363XB if you need one for 2018 – 2024.

Works Great With

    • RETURN & EXCHANGE
    • YOUR NEAREST DEALER
    • E-GIFT CARD
    • MILITARY DISCOUNT