On my ITA Civic I currently have a 4-2-1 header which goes into a huge (4ft long) Cherry Bomb muffler and then exits before the fuel tank, which I don't like so it's time to improve. Right now I am thinking of doing a 2.5inch exhaust pipe off the header that leads to a Moroso Spiral Flow Muffler that continues on as 2.5inch pipe that exits out of the passenger side just past the door. Are there any other more effective exhaust and/or muffler options that optimize performance?

Thanks,
Steven