I have to say I was suprised with this Header. I have a 00 Civic Ex 2dr A/T with AEM short ram intake, Apexi N1 cat-back and up until today had a DC sports SS 4-2-1 header. The DC sports was ok, much better than stock, but really did not feel that much differnce at the wheels. I have been told that comptch is real good but costs $$$. So after six months of having the DC sports I went and got the comptech ss tig weled 4-2-1 Header. I can feel the differecne at the wheels. Even with my A/T (I know that it eats up power , but I love my car) I can feel the differnce. At the wheels my car picks up and goes, I just hit the gas and she picks right up. Even helped to give me a nicer tone when vtec kicks in. I love it and I am happy with comptech. I hope that this header will last in performace and quality.