I looked under my car the other day and saw something interesting. When the two pipes come otu of the engine they connect to this huge has Catalytic converter i think it is...an dits shaped like a triangle where the wider part of the triangle is towards the outlet and there is a hole on the bottom left of the triangle where the pipe goes to the muffler and on the right..there is an outlining for a second pipe that could be added. Also, there is an extra space for a second muffler to be added on the right side, it is just covered with a piece of plastic (its empty under the plastic). The place for the exhaust piping is also there. Do you think that adding a Second pipe and muffler to this car will make the horsepower difference from teh coupe and sedan or if not, any horsepower diff at all? Will it make a difference on the sound?