For GTs, it all comes down to whether you want an H-pipe or an X-pipe. X-pipes have a freer flow, which is great for performance. But H-pipes can deliver that deep muscle car growl that most Mustang enthusiasts prefer. Either is going to be less restrictive than the factory exhaust, and help improve your performance.

If you have an EcoBoost, then you'll have a Y-pipe. Aftermarket Y-pipes are not only wider, allowing for a better flow, but they also usually include a resonator delete. Dropping the factory resonator can give you a more booming sound. Getting rid of the resonator also drops your weight by about 23 pounds. While that's a small drop in the bucket, every bit of lost weight is a boon to your performance and speed.

A great mid-pipe can dramatically change your exhaust sound without breaking the bank. Whether you're planning future exhaust modifications or just looking for a slight sound tweak, a mid-pipe is a great supplement to any exhaust.