Our resonator deletes are designed to noticeably improve your exhaust note, whilst being a direct replacement for the OEM Exhaust section making fitment easy & straighforward. Crafted from T304 stainless steel, our resonator deletes are made to last. ---Manufactured from high quality T304 grade stainless steel ---Mandrel bent and fully TIG welded for strength and durability ---Designed to improve power and torque across the entire RPM range ---Free flowing to get the most from the 2.5L N53 engines ---To fit the OEM system and most aftermarket backboxes Compatible with: BMW 3 Series E90 E92 325i 2.5L petrol N53 engine 2005-2013 models.