Best Brand Gold Exhaust Fake Turbo Whistle Pipe Sound Muffler Blow Off Valve Bov-Size: M Material: Made of light weight aluminum CNC Machined from 6061 T-6 Aluminum Made of light weight aluminum CNC Machined from 6061 T-6 Aluminum 1" muffler tip for best effect (OEM Muffler) Install on Aftermarket muffler, Catback, Axleback muffler it will not produce any sound. Screw the screws on the Turbo Sound Whistle to tighten the item so it doesn't fall off while driving