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This cat-back exhaust system from Neuspeed features aerospace quality T-304 stainlee steel and 70mm mandrel bent tubing throughout, capped with a set of hi-flow mufflers with highly polished quad straight cut tips. Fits Audi S4 (B7) sedans; adds approximately 6-8 horsepower. Note: system may not meet state sound level regulations as measured pursuant to SAE Vehicle Standard J1169 Rev. May 1998.