I currently have a Stillen Axelback... I honestly am not a fan because the in-cabin noise is loud and the sound isn't deep enough for me. There have also been discussions that the diameter of the pipe is too small for future upgrades with high amounts of horsepower... I'm debating on buying an Injen Catback exhaust or just making do with a Stillen mid-pipe since I already have the Axelback. For those who have an Injen / Stillen Catback exhaust what are your thoughts? Why do you or don't you like your exhaust set-up?