AMS Efficiency 2020+ BMW B58/Toyota Supra A90 Avenue Downpipe w/GESI Catalytic Converter
Catalytic Converter: W/ Excessive Circulation Cat
Used for 8600 miles on my 2021 X3 M40i with zero CEL’s or pending codes and gave the automobile extra low and torque and significantly better sound (not loud) and it has the right AMS match and end!
I am promoting it as a result of it upgraded to an F97 X3M
