MILLTEK SSXBM1098 Cat-back Twin 90mm GT90 BMW 2 Series M240i CoupeDescription MILLTEK SSXBM1098 Cat back Twin 90mm GT90 BMW 2 Series M240i Coupe From 2017, many vehicles have been equipped with a Particulate Filter to further reduce emissions. The Milltek Sport Particulate Filter Back range is designed to compensate for the sound reducing qualities of the particulate filter and significantly improve the sound aesthetic of the exhaust system. All performance exhaust systems are designed for a wide range of vehicles.