[e36montes]

I have a 2018 G30 540i M sport. I just recently installed a downpipe and tuned it. I’m stage2 91 Octane. A guy at AutoZone was telling me it would be better to get an axle-back exhaust system versus just cutting off the muffler because supposedly that will damage the valves, has anyone that did a muffler delete noticed their valve get damaged or had to replace it?