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Here's a comparative look at the attenuation disc/restrictor plate (left) that Ford installs in side-exit exhaust pipes on Boss 302 Mustangs and the new electric cutout we're installing on Paul Danett's '12 Boss. It's clear how restrictive the factory piece is, as there's barely a pinhole for exhaust gas and sound to escape through. The QTP cutouts (right) are variable, and can be partially or completely opened or closed to produce a myriad of exhaust notes. A Boss sounds a lot meaner with the cutouts open!