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I have the weapon-r header and love it. I don't think having the short ram intake will affect the sound of the header at all. If you have the stock exhaust I doubt you will be able to hear it at all. I have an axle back exhaust and I barely noticed an increase in volume but a huge change in tone. There is a definite performance advantage. I raced my brothers xA which just has exhaust and I have I/H/E and pulled about a car length on him by the time we hit 70.
so what is the best header to purchase for a 04 xa? I have 2 1/4 pipe ran for the cat back and a obx muffler. I just want a little more power gain. I have the injen cold air intake on it also. Any response would be appreciated. thanks.
Get a header with the longest primary you can find. If you want a 4-2-1 look for the longest secondary. These are small engines & need length to scavenve properly.
Hotlava1886 may be right, as the DC has the longest primary I'v seen.