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These High-Flo catless downpipes are designed to help improve your turbo charged vehicles performance. Pipes are made from polished 304 stainless steel. The downpipe has an inside diameter of 4" with 2.5" flanges. The larger diameter design will improve exhaust flow to keep boost pressure up and provide improved throttle response. By installing this downpipe you will eliminate the stock catalytic converter. Down pipe has two oxygen sensor bungs so you can retain the factory inputs. A tune is recommended to maximize the performance of your car after downpipes are installed. A must have for all 135i and 335i enthusiasts with the single turbo cars. Comes with 3 year warranty. Fits E82 135i models. Over 80 sets sold with zero issues! Check out the quality

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