I bought this Mustang for an every day driver so I could keep the miles off of the Cobra. It was 100% stock minus weld in Flowmaster mufflers and in box K&N filter. I currently have a set of 3.73 gears, long tube headers, off-road H pipe, 2.5 stainless catback, and a GT-40 intake waiting for install and should be installed by spring.