Cat-back #exhausts are made to make #performance somewhat better than a stock system. They also make for a deeper rumble ?? and help lower the amount of burned #fuel during #acceleration ⛽️⬇️. A #catback performance exhaust in #Australia ?? is considered an entry-level system for #petrol heads ?️ that just want to dip their toes ?. https://australiasuniquelifestyle.wordpress.com/2024/06/06/performance-exhausts-101-types-materials-and-features-explained/