Hello, Welcome to our store. Quality is our top priority, and we provide excellent customer service. Dimensions: 12 x 7.5 x 3.5 cm / 4.72 x 2.95 x 1.38 in (L x W x H) Weight: 128 g Package Includes: - 1 x Exhaust Pipe Sound Simulator (Fake Blow-Off Valve) - 1 x Set of Screws - 1 x Spanner Sizing Guide: - S Size: Fits engines with displacement of 1.0–1.6 L; exhaust pipe diameter: 32–43 mm - M Size: Fits engines with displacement of 1.6–2.0 L; exhaust pipe diameter: 37–48 mm - L Size: Fits engines with displacement of 2.0–2.4 L; exhaust pipe diameter: 44–55 mm - XL Size: Fits engines with displacement above 2.4 L; exhaust pipe diameter: 56–85 mm Product Name: Exhaust Pipe Sound Simulator Available Colors: Silver, Gold, Black, Blue, Purple Features: - Produces a clear whistle-like sound - Universal fit for most vehicles with straight exhaust pipes - Easy to install - Sleek, modern design Important Notes: - This product is designed for straight exhaust pipes only — not compatible with bent or curved exhaust pipes. - The sound produced is similar to a flute or whistle — not a turbo blow-off or sports car sound. - This is a simulated sound device only — it does not modify engine performance or emissions. Package Includes: 1 x Exhaust Pipe Sound Simulator (color selected at random unless specified).