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The serrated/helix combination design also reduces intake whistle that occurs with helix-only designs (US PAT 07055513)
For models with tips that exit "Under the bumper" (bumper does NOT haves notches on the bottom)
Lift kit which provides more ground clearance
Only use daytime running feature in accordance with local laws
Front and rear manifolds with integrated catalytic converters (sold as a set only*)
BD Diesel Module - Idle Verifier (DFIV) 1998-audi-a4-quattro-avant-esi7945533 The serrated/helix combination design alsoBD Diesel Performance is unique among its peers in that it designs, manufactures and distributes a wide range of products specifically engineered for performance diesel applications. Located in Abbotsford, British Columbia, Canada, BD's state of the art facility covers 65,000 square feet, and employs 60 plus highly trained individuals. The BD name became recognized in 1989, when the company introduced the first exhaust brake for the burgeoning diesel
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