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Becker Stainless Steel Header Fitment For 10-12 Audi S4 B8/8T, 07-12 S5, 11+ A5 Quattro, 12+ A7

Improves performance . efficiency . and horsepower ~12-16 Horsepower Gain Mandrel bent for smoother exhaust flow Dual T.I.G. welded construction for stronger hold  No installation instruction included in this kit . we recommend professional installation Manufacturer's Limited Lifetime warranty against manufacturer defects (Must fill out and return warranty card with a copy of the receipt and within 30 days of purchase date) Primaries: 1.6 " OD . Port Shape: Circle . Port ID: 1.6" ID . Collector: 2.7"OD . Outlet: 2.4 " ID . Main Piping Size: N/A . O2 Bung: 2 . EGR: N/A

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