The next thing most people install on their cars is an aftermarket exhaust to help it breathe better to free up a few ponies as well as give it a sportier tone. Headers are covered in a different topic. All these models will fit all Duratec motors unless otherwise specified. The only exception are those with the factory 06-07 Street Appearance Package which may require a little modification.
Common brands are:
FocusSport regular and stealth models
There is also always the option of having a system custom ran at a local shop. Make sure you are specific about exactly what you want done so you don't end up with a cheap muffler and 1" rusty tubing.
There are many issues to discuss when talking about cat back systems. Here are a few of them.
One thing an aftermarket system will always have over stock is a distinctive sound. Sound is a personal choice, whether you want it to be loud and deep or quiet and rumbling, there is a cat back setup for you.
Many systems are much louder than stock. When this becomes a problem especially when combined with a race header, you have a few things you can do to quiet your system down. FocusSport offers a stealth option which adds a larger resonator to the system, Trubendz offers the ability to customize your set up by choosing your own muffler and resonator.
This is to me one of the most important aspects of a an exhaust system. To start with, when choosing your setup, you need to take into consideration some of your future plans. If you are planning on staying relatively mild and just using bolt ons, then a 2.25” system will be more than enough for you. However, if you plan on a serious N/A build or the use of forced induction, a 2.5” system will provide much better gains. Borla, MBRP and Trubendz make the best 2.5” cat back systems
Cat back setups can run anywhere from $125 all the way up to $650, its up to you what you want to spend. The gains are not increased by spending more however the advantages of Stainless Steel (especially in northern climates) are well worth the money.
Trubendz Exhaust System Install on a 08' Sedan
Exhaust Videos and Sound Clips
Comments, discussion, and corrections welcome!