Roush 421240 Cold Air Intake Kit 3.7L Mustang V6 (2011-2014) V6 Mustang Roush 421240 Cold Air Intake Kit 3.7L (2011-2014) This Roush Cold Air Intake Kit 421240 for the 3.7L 2011-2014 V6 Mustang is a huge improvement. Great the performance and fuel efficiency. Get rid of the restrictive factory air filter... MSRP: Was: Now: $355.99