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Description: - Professional Aluminum Alloy quality of manufacturing - Lack of differences in the thermal expansion between the manifold and the caps - Swirl flap delect plug,a nice replacement for your old or damage one Note: Smaller swirl flaps (22 mm), designed for vehicles manufactured up to 2004. Larger swirl flaps (33 mm), designed for vehicles manufactured since 2004; You need to measure the hole in the manifold for engines made in 2004. In 2004 were used two sizes of swirl flaps. Package include: 6 * Swirl flaps removal for BMW