The AWE Touring Edition axle back exhaust is a straight-through concept, yet also features AWEs proprietary drone-canceling solution, 180 Technology to produce the perfect, drone-free exhaust note. Made in the USA, AWE axle back exhausts are handcrafted from US-sourced T304L stainless steel, and come with a fitment guarantee, a no Check Engine Light guarantee, and a Lifetime Warranty. Complete with your choice of Diamond Black or Chrome Silver double-walled 80mm tips. IMPORTANT NOTE: Quad tip configurations are only available for the 3/428i. If you are opting for the quad-tip option, be sure to also purchase the quad-tip marking template.