Higher-quality car performance components would increase horsepower and provide greater economy per litre of petrol.... moreHigher-quality car performance components would increase horsepower and provide greater economy per litre of petrol. Furthermore, aftermarket components are often of higher quality than the factory replacements, as well as the cost difference is negligible. Duramax Exhaust is preferred by many people. Most of the people in today’s time choose to upgrade their vehicle’s performance and parts.