Scorpion BMW F97 X3M Non Resonated OPF/GPF Delete Pipes (Pre-LCI)Scorpion Exhausts OPF Delete Package for the BMW X3M F97 is a great value exhaust upgrade as a stand alone or when combined with the Scorpion BMW X3M OPF Back System. Available in a non resonated (louder) configuration. By removing the factory OPFs, your exhaust system will be far less restrictive. More free flowing exhaust gases means more power, better sound and increased tuning potential. If you're looking for more, this mid section can be paired