Parts & Accessories Spare parts In the name of God, the Most Gracious, the Most Merciful. Two F1 mufflers, the first is a dual-valve system and the second is a single-valve system, with a downpipe. Each has a price and its sound is excellent and the muffling is excellent. Dual-valve system: 450 SAR Single-valve system: 300 SAR Downpipe: 150 SAR