Milltek large bore downpipe with HJS Hi-Flow sports catalyst for the BMW G87 M2, G80 M3 and G82 M4 (S58). High-flow 76.2mm (3-inch) construction with HJS HD sports cat reduces backpressure and unlocks turbo response and top-end power. T304L stainless steel, mandrel-bent, race product. Direct fit to the OE or Milltek system. Key Features: HJS Hi-Flow HD sports catalyst Large bore 76.2mm pipework for reduced backpressure T304L stainless steel, mandrel-bent Direct fit to OE or Milltek exhaust systems Fits: BMW M2 (G87), M3 (G80) and M4 (G82) with S58 engine