Allows you to open up your exhaust for straight-through flow by simply turning a screw. Slight power gains when used on modified motors. 4" diameter. Sold each. Made in the U.S.A.

• Polished end cap for SuperTrapp mufflers
• Allows you to open up your exhaust for straight-through flow by simply turning a screw
• Slight power gains when used on modified motors
• Made in the USA
• Sold as each