This mid-pipe runs from the downpipes to the stock rear silencer, deleting the center silencer, secondary cats and OPF. It converts the exhaust track from a double pipe into one. This results in a more full-bodied exhaust sound with a deep tone. Requires an ECU tune (recommended) or OPF deleter unit (Available here: https://autotopnl.shop/nl/products/leib-cat-and-or-opf-delete-kit-pro-for-bmw-g8x-m3-m4-competition?_pos=2&_sid=de5c14647&_ss=r )which removes the OPF fault codes (since it's gone). Fits G80 G81 G82 G83.
