BMW F80 M3, F82 M4 & F87 M2 Competition S55 Decat Downpipes Ceramic CoatedEnhance the performance of your BMW's S55 engine with the SLN Ceramic Coated Decat Downpipes, designed specifically for the M2 Competition F87, M3 F80, and M4 F82 models. These downpipes feature a 3. 5 inch diameter, providing a significant power gain, faster turbo spool up, and improved throttle response. Key Features: These are the largest bore downpipes on the market for those wanting the very most performance Ceramic Coating to reduce engine bay