Doubt I'd even put an aftermarket air filter on it... I just want something quiet, reliable, decent fuel economy and comfortable with a side of pimp. In fact, I wish they were 4bangers... from my research it looks like they only get 21mpg highway, and PROBABLY take premium haven't really found a soruce... my expedition (5.4L 6,000lb+ 3.73 gears) gets 17 hwy, 15 city, on 87 octane wtf?