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Installed custom engine tuning
and more reliable than the factory design
Single tune file only
Tune your 2024-2025 Silverado/Sierra 2500/3500 with the 6
send-in upgrade service is required to enable diagnostics and tuning capabilities through VCM Suite
Big Boost Valve Spring Kit | 1998.5 - 2024 Cummins Tuning Packages Installed custom engine tuningFrom daily drivers and heavy duty tow rigs to full blown drag strip builds, these springs are engineered to handle everything from mild upgrades to wild performance. Unlock the full potential of your Cummins engine with the Performance Diesel Worx Big Boost Valve Spring Kit, engineered for superior performance, durability, and reliability. This complete drop in package delivers 103 lbs. of seat pressure and 176 lbs. of open pressure at 0. 420