Catalytic Converter W/Flex Pipe fit for Buick Regal/LaCrosse 2.4L 2011-2016 EPA 72423787Just a friendly heads up: This catalytic converter is specifically designed without an oxygen sensor bung (no pre drilled port). If your vehicle needs an oxygen sensor port to work properly, modification will be requiredand this product works with professional mods (e. g., drilling or welding a bung) to add it. To ensure a good fit, we recommend double checking if your vehicle requires this port before purchasing. Thank you fit for your attention!