High-quality Catless Downpipe for BMW E39 525d and 530d models with M57 engine. FITS THESE BMW MODELS: BMW 5 Series: E39 [1998-2004] 525d (120kw / 163hp) – M57 530d (135kw / 184hp) – M57 530d (142kw / 193hp) – M57 Note: If your model is not listed here, look for it under another product. If you cannot find your model anywhere, contact us for assistance. SPECIFICATION: • Quality stainless steel (SS304) • Downpipe diameter: 2.5″ (63.5mm) • Flange to turbine diameter: 63.5mm-72.5mm • Connection to exhaust (stock): 2″ (51mm) OEM reference part numbers: 18 31 7 785 557, 18317785557, 7785557, 18 10 0 418 187, 18100418187, 0418187, 18 31 2 247 991, 18312247991, 2247991, 18 31 7 785 961, 18317785961, 7785961, 18 31 2 248 262, 18312248262, 2248262, 18 31 7 785 911, 18317785911, 7785911