The new model features a host of improvements including new advanced technology like the 12 - inch digital cluster and available active valve performance exhaust system. (tprm.com)
Quiet Start comes as part of the optional active valve performance exhaust system. (evo.co.uk)
According to Von Foerster, «Both new Quiet Exhaust mode and Quiet Start features will be part of the available active valve performance exhaust system on the new Mustang GT, along with different exhaust volumes for Normal, Sport and Track modes, giving customers more choice than ever before. (mustangandfords.com)