AWE Performance Mid Pipe for BMW 340i/440i models:The AWE Performance Mid Pipe is non-resonated and replaces the factory resonated section with straight-through 3-inch T304L stainless steel tubing. Perfect fitment, ready to rumble. IMPORTANT NOTES ABOUT THESE PRODUCTS:If you’re looking to equip your F3X with the Performance Mid Pipe only, please note that cutting the stock exhaust is necessary.