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If you are building the system from scratch, you have two directions to go, each with pros and cons. The first option is to run a single 2 1/2" - 3" system. To build this you run two 2" - 2 1/4" and y them together on the passenger side, It is essential that this y be as smooth as possible for maximum flow and torque. It then runs into the remaining single exhaust where it goes into your muffler (or glasspack). The smaller size system will be more condusive to good fuel economy and peak torque at a lower RPM. The larger pipe size is more for peak horsepower output and racing.
The other option is to run a dual exhaust, which does not have the same sound or benefits it would on say a mustang. The reason is that your two runs will be if different lengths because you have to route both pipes to the drivers side. Dual systems are easier to mess up, they take more pipe, more bends, more time, and they do not always produce the desired results. Adding an x-pipe or h-pipe helps offset the balance issues and makes the system more consistent. Even so, it is debatable that this system can outperform a well designed single system.
If you like the look of duel exhaust and want maximum sound output, you can run a dual outlet muffler. This setup is very balance sounding, tends to be fairly loud (depending on muffler choice and pipe size), and is both easier and less expensive than true duals.
Other things to consider include the way the pipe is bent. Finding someone who can do mandrel bending can be difficult, but mandrel bent 2" tubing will outflow crush bent 2 1/4", and will maintain low end torque better too. Most muffler shops use traditional press benders. These are still ok for power so long as no sharp bends are made. Some shops will recommend using a larger diameter pipe where there are a lot of bends to overcome the restriction. In my opinion, this creates more backpressure than it is worth, the pipe size should remain more consistent and will flow better if it has as few joints as possible. Avoid wrinkle bends. These types of benders are a form of press bender that deliberately wrinkles the inside edge of the pipe to prevent it from crushing inward. The problem is this creates a lot of turbulence and backpressure, more so than the diameter reduction of a press bend.
This should give you a fairly rough idea of how to get started. Building an exhaust system is not typically a DIY job unless you can find a bolt on kit. Even at that, many kits still require you to have tools and knowledge associated with exhaust systems. Welding is an important skill, and having an impact wrench can come in handy. As a result, unless you can find a truly complete system, you should have a local muffler shop fabricate your exhaust. You can use this posting to give you a rough idea of what you want so that you can pass it on to your installer. However, don't let him tell you what you want, it is much better that you have your mind made up on which system will be the best for the way you drive before you go in. There are just some shops who forget who the customer is, and will insist on doing things their way.
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