chuy_xgamer
Member
Registered: 2nd May 05
Location: Monterrey, Mexico
User status: Offline
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Dual Exhaust
Dual exhaust on a four cylinder car, as in one pipe joining cylinder 1 and 4 and another joining cylinder 2 and 3, and then travelling side by side to the back of the car, passing through separate mufflers, and then ending in separate tips, is going to cause power loss. To cause an extraction affect, the secondaries of the 1,4 and 2,3 pipes must join. Not doing this will cause power loss by lack of extraction at that point.
Two tail pipe exhaust is a waste. It adds only weight. There is no performance gain from having exhaust pass from one correctly sized pipe into two separate pipes. In fact, the turbulence of separating the exhaust flow by forking it into two pipes will cause back pressure and will likely reduce power. In addition, the added weight of a second pipe that serves no purpose to enhance power will do nothing but add more metal for the car to drag around. No power gain and more weight is a waste.
If someone wants to do this for looks and appearance, that is fine. It does look nice to have two tail pipes coming out, one on each side of the license plate. However, don't be fooled into thinking that this will enhance performance and just accept that you are adding weight to the car solely for appearance purposes. 
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