i have a 2009 ex 2 door and i already have the skunk2 exhaust system installed and i love it. how much more hp would s2 headers add?

 

You have a Ex which means you have a differnt motor then the Si which is a K20Z3. The S2 header is designed for a K20. Your Ex has a R18 which can get a downpipe i believe due to your header being welded to the head. Im not positive on that but I do know that a header for a Si will not work on a ex,lx or dx due to different motors.

 

megan racing makes a header and downpipe for your car.
skunk2 is only for the si.

 

thanks for clearing that up.