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i have dc 4-2-1 header..i cant really tell the difference. i would like to believe that at top end, i increase hp..but...alls i can tell is that my car makes a hissing noise that bothers me at times. I dont plan on getting exhaust so thats probably what restricts my header from being used to its full potential...
BTW i paid 240 for my dc header.
 
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