Turbo Catless Downpipe kit For BMW S58 M2 M3 M4 G80 G82 2021+ Exhaust. 1:S58 M3 M4 Competition Downpipes are made to maximize exhaust flow for highest power gains. 2:Designed using the latest in CAD technology; this part is made to fit perfectly in place of restrictive factory catalytic converter. 3:When installed with factory exhaust it produces a louder and deeper growl with much more pronounced exhaust “crackle” on downshift. 4:Wrap the surface with an insulation board to prevent damage to the engine caused by high exhaust pipe temperatures 5:Stage 2 software is required to avoid check engine light. 2021+ BMW S58 M3/M3 Competition 2021+ BMW S58 M4/ M4 Competition Stage 2 software is required to avoid check engine light. We are all human beings, we all make mistakes so if you received a wrong item / missing item / or any other concerns regarding your orders please give us a chance to fix it first before leaving a bad feedback. We still aim for the best service and products so if you have any question or concerns please talk to us first! We are always here to help and we will do our best to make sure your problem is resolved in a fair and satisfied way. It is YOUR responsibility to pay for the custom duty not us. We have no control over your country`s custom department so we have no idea how much they charge. All exhaust system components will alter and affect the vehicle’s overall sound in pitch and volume. All to which is subjective in manner. Recommended for Racing/Off-Road Use ONLY, Will Not Pass Emissions Test.