Which headers will add the most hp on my Acura RSX Type-S.?
the bigger the header tubes are the more horsepower, they make headers with bigger and smaller tubes and the smaller tubes will give you more torque and thats what you need for the street for red light to red light dashes, if you want top end power you go with the bigger tubes, headers are usually good depending on the engine size for another 15 to 30 horsepower, as the 30 horsepower is on a large V8.
