if you already have the headers what else do you need for an exhaust system?
The next part is a Hi flow cat then a Sports muffler. Then all 3 work together for better flow.
it all depends of what you want to do to your vehicle. just remember that what ever you do to the exhaust you gotta do to the intake. you simply have to even it out. some people put headers into vehicles to lose back pressure, and others may put thicker exhaust for the same reason. yet they forget that if bigger is not always better.
well headers are only one section of the exhaust system. it is useless putting on headers if you still have the stock exhaust piping. think of it like sucking juice through a straw, if you make the straw wider at one end but keep it narrow at the other it really won't matter how wide it is at the one end, it will only be as restrictive as the most restrictive part, if that makes sense? You need to get piping that fits the headers and run it down the rest of your car. but if you're going to put that kind of money into the car, you'd probably want to make sure you have the intake side down as well to help increase performance