The AA EL mid pipes can just produce a lot of rasp depending on the full setup (downpipes , rearbox combo) and I think people would be able to tell if its actually noise from rubbing on the frame or not.
If you listen to @50shadesofhockenheim on instagram it sounds pretty bad. I'm sure his was installed correctly..
..but if you listen to @am_m2c his sounds pretty good and clean.
Edit: had hockenheim_m2c earlier but was mistaken for 50shades
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-2021 M2C, HS, 6MT
-AST 5100, AP Racing 9660, BMW-788M, RF-GT4, BW-TA5R, APR GT 250 Wing & Front Splitter
-TMS Diffuser, TMS F80 Skid Plate, HEX Armor PPF, CAN-Checked Data Logger, RaceBox
-Recaro Pole Position , 2kBody Half Cage, Pinnacle Motorsports Half Cage (On order), CAE Shifter
-Remus Race + BR EL Mid