for my 02 civic EX automatic, should i get a Koami 4-2-1 header, or a DC-S 4-1 header? Im just looking to add more hp preferably in the lower rpms like i want better off the line starts when i race my friends.. that type of thing. I just flat out want to make my car more powerful. (rough estimates of how much hp ill get would be great? Any suggestions?

 

I got an auto civic here, and a DC 4-1 won't fit me, I dont know about you though. But if you're looking for more low end and mid range power get a DC 4-2-1. A rough estimate, damn, I'll say maybe 4-7 HP. If you really wanna make a difference in your exhaust and get the most power out of it, you have to get a cat back, and a high flow cat.
Andrey

 

Yeah I have a GReddy EVO II Cat-back on the way and i already have an intake. Thanks