The MagnaFlow Overland Series Cat - Back Exhaust is perfect for Toyota 4Runner owners who love off - road adventures and long highway drives. When you're navigating rough terrains, its high - clearance design gives you better ground clearance and departure angles, so you don't have to worry about scraping the exhaust. On the highway, the No Drone Technology ensures a quiet ride. It's suitable for anyone who wants to enhance their 4Runner's performance and sound. The main piping has a 2.5 - inch diameter and is mandrel bent, and it's made of 100% stainless steel for long - lasting durability.