the ceramic dc headers were put on my car along with a rs*r catback exhaust and aem cai. difference compared to original horsepower? barely noticeable. i have an ex coup too. after spending all that money and time on researching about the parts, i probably feel an extra 5 horses. do yourself a favor, unless you have an lx.. dont bother wit it. i think the ex's were pretty much tapped out in horsepower. sorry about the ranting.. i just felt like i should "feel" more of a difference with the parts i have, after all, they are supposed to be "performance" parts right? yea right..