Tuning Stainless Steel Exhaust pipe For BMW M3/M4 G82 G80 G83 G8X 3.0T 2019+ free flow exhaust Feature: 1.100% 304 stainless steel material, corrosion resistance and high strength 2.TIG welding much more strong than normal welding 3 .Thickened heat insulation design reduces engine high temperature 4.The inner wall is smoother, Emissions are smoother, improved the horsepower and performance. 5. 100% bolt-on easy installation