Dad just bought a 2013 Mustang GT 'vert. Since his birthday and father's day are so close, I usually just double up and get one big gift. Looking to get him something for the Mustang, intake, exhaust, etc. Not sure which is the preferred intake, or if they are even recommended? If it's an exhaust, nothing terribly loud as it's a DD and he's an old man. Any recommendations would be great, thanks!