- The XFORCE - 3" Inch Inlet Twin Tip Oval Varex Muffler features a dual/double-walled straight cut tip with a flanged, stainless steel material that has an oval barrel shape. Maximize your vehicle's performance with the XFORCE - 3" Inch Inlet Twin Tip Oval Varex Muffler. Its dual/double-walled straight cut tip and flanged, stainless steel material offer superior durability and an oval barrel shape for increased airflow. Enjoy improved exhaust sound and reduced backpressure for optimal engine function. Trust in the expertise and quality of XFORCE to take your car to the next level.