Frequently Asked Questions About Mack CV/GU Truck Engine & Performance Parts

What years and models are these engine and performance parts compatible with?

These parts are specifically designed for Mack CV Series (2000-2019) and GU Series (2004-2015) trucks. Most engine components are compatible with Mack MP7 and MP8 engines commonly found in these models. Always verify your exact engine model and serial number before ordering, as some parts may have variations between early and late production years. Check the individual product descriptions for specific year ranges and engine compatibility details.

Are aftermarket performance parts worth it compared to OEM, and will they void my warranty?

Quality aftermarket performance parts from reputable manufacturers can offer comparable or superior performance to OEM parts, often at a lower cost. Many aftermarket parts meet or exceed OEM specifications and come with their own warranties. Installing aftermarket parts typically won't void your entire vehicle warranty, but it may affect warranty coverage for related components. We recommend checking with your dealer if you're still under warranty and keeping all documentation for parts installed.

What are the most common installation challenges for engine performance upgrades?

The most common installation challenges include ECM programming requirements for certain upgrades, clearance issues with aftermarket turbo or exhaust components, and the need for specialized tools for items like injectors or camshafts. Many performance air filter and exhaust upgrades are straightforward bolt-on installations taking 1-3 hours. However, major engine modifications like turbo upgrades or cam swaps require professional installation and tuning. Always factor in installation costs and complexity when planning upgrades.

Which performance upgrades provide the best fuel economy and power gains?

For the best combination of fuel economy and power gains, start with a high-flow air filter system and a performance exhaust, which can improve efficiency by 3-8% and add 15-30 horsepower. ECM tuning or performance chips offer the most significant gains (up to 100+ HP and 10-15% better fuel economy) but require professional programming. Upgraded charge air coolers and intercoolers help maintain consistent power while reducing engine stress. Remember that driving habits have the biggest impact on fuel economy regardless of modifications.

How do I know if performance parts are CARB compliant and DOT approved?

Look for parts specifically labeled as "50-state legal" or "CARB EO certified" in the product descriptions. These parts have been tested and approved for use in all states including California. Most exhaust systems and air intakes we carry will indicate their compliance status. For emission-related components like EGR deletes or DPF modifications, be aware these are typically for off-road use only. When in doubt, contact us with your specific state requirements and we can help identify compliant options for your application.