Originally Posted by TheOtherDave™
The test pipe will make your car louder.
The RSR [ExMag, I assume] muffler will help -- to a point.
The test pipe will also do serious harm to the air we all breathe. So, for a few more hp, I urge you to reconsider based on the increase in pollution alone.
i agree 100% get a high flow cat if anything yoru hp increase will not even be noticable with a straight pipe!