i got a civic ex with a d16y8 and i am wanting to get headers for my car. i already have a skunk 2 cat- back and aem v2 intake and i want to know which combination (4-2-1 or 4-1) cause i already know that 4-1 is more for redline power and top end but i also know that isn't always true on all the cars and which headers are the best for my car. thanks