Quote:
Originally Posted by A418t81
Dual 3" exhaust is beyond overkill for a <400 whp vehicle. It will more than likely cause your low end to suffer (exhaust gases travel too slowly and cool in the pipes which slows them even more). Contrary to popular belief, a huge exhaust on a turbo car with small turbos is NOT the way to make power in areas where the turbos will shine.
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^^True
The reason no exhaust is great on turbo cars is that there is no way for the exhaust gas to cool on its travel to the rear of the car. If the piping is to big then the exhaust gas cools to rapidly and causes a turbulent flow. All this is bad for efficiency obviously.
If you have to have an exhaust system (99.9% of us) then you want to match the pipe sizing with you HP and space available. Dual 2.5 is great for this car. Remember, each path is coming from only 3 cylinders @ a total volume of 1.5 liters. Think about the old 1.6l hondas. They came stock with 1.5" exhaust. Even when turbo systems are added a 2"-2.25" exhaust is optimal.