Exhaust System - Milltek GPF-Back - Non Valved - GR Supra A90Milltek stainless steel "non valved" exhaust system for GR Supra A90 The Milltek Sport Particulate Filter Back exhaust system is designed to compensate for the sound reducing qualities from the particulate filter and significantly improve the sound of the exhaust system Non valved system EC Approved 2. 76" pipe diameter Fits from particulate filter back Designed and manufactured in the UK This system is not valved to help increase noise. Note: Stock