Universal Car Turbo Sound Whistle Exhaust Pipe Oversized Roar Maker -For Auto RC

Whistle Caliber:18mm (S) / 23mm (M) / 27mm (L) / 31mm (XL). The product is only suitable for straight exhaust pipe, but the bend exhaust pipe can not be installed. Used to make your vehicle sound like a turbo vehicle with the turbo system or blow off valve.

eBay