Grand Rock – 94-02 Peterbilt 359 & 379 Retro Fit Duplex Kit w/ Offset Brackets

Grand Rock – 94-02 Peterbilt 359 & 379 Retro Fit Duplex Kit w/ Offset Brackets

The Grand Rock 9402 Peterbilt 359 & 379 Retro Fit Duplex Kit w/ Offset Brackets is a complete exhaust conversion solution designed specifically for 2002 and older Peterbilt day cab and Unibilt models. Engineered to fit the Peterbilt 359 and Peterbilt 379, this retrofit kit allows owners to upgrade or replace their existing exhaust system with a properly aligned duplex configuration. The included offset brackets are designed to ensure correct stack positioning and clearance, delivering a clean, professional installation while maintaining the classic Peterbilt look.

Each duplex kit comes fully equipped with high-quality components to simplify installation and ensure long-term durability. Supplied with picket-style 90-degree elbows, 52″ spool pipes, lower cab brackets, stack mount brackets, protective grommets, and Grand Rocks industry-leading pre-formed clamps, this package provides everything needed for a secure and reliable fit. Built for heavy-duty performance and daily road use, this retrofit kit offers both functional exhaust efficiency and a polished, show-ready appearance.

• Designed to fit 19942002 Peterbilt 359 & 379 Daycab and Unibilt models

• Offset brackets ensure proper stack alignment and cab clearance

• Includes picket-style 90 elbows and 52″ spool pipes

• Supplied with lower cab brackets, stack mount brackets, and grommets

• Comes with premium pre-formed WFC-5Ss clamps for a secure, leak-resistant fit

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