Hey everyone hope your doing well I’m looking into modifying the exhaust on my 2L petrol 2018 seat Leon DKZA engine 190 BHP DSG I believe this car has an OPF/GPF filter however has anyone done any modifications without removing the filter ? I’m looking at a back-box delete which will also allow me to get quad exits however how much noise change should I expect ? Please post videos or pictures of modifications done previously. Thank you
