EXHAUST SYSTEMS
(UNDER CONSTRUCTION)

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SOME EXHAUST GUIDELINES
The better your engine can exhale, the more power you can get from it. Your main enemy is back pressure - how much pressure the engine has to exert to push the exhaust through the exhaust system and out to open air. A small pipe diameter, kinks, bends, and anything that can interrupt a straight air flow will increase the required backpressure. The less back pressure the better, but don't start putting in that giant 5in piping just yet!

The next thing you got to worry about is exhaust stream velocity - how fast the exhaust gases are traveling. The bigger the piping you use, the slower the exhaust will be. You see this same effect on your garden hose when you wash your car. The more restrictive you make the garden hose opening, the faster and farther the water goes, although less water is coming out at a given moment. So carrying on with this analogy, you want to open up the restriction on the garden hose so that more water goes out, but at the same time, you don't want it so big that the water comes out so slow, that the only thing the water is good for is to wash your feet!

So, sheesh, what size should I get?
For a naturally aspirated engine, the VQ, being a 3 liter, 2.5 inches is best. Any more and you'll start losing low-end. Adding nitrous? then about 3.0 inches is best. If you're running boost, 3-3.5 in diameter is good.