Thread: [For Sale] Stillen 409 Stainless Headers
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Old 09-19-2011, 12:30 PM   #10 (permalink)
Siciliano15
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Quote:
Originally Posted by ddvette9 View Post
Sound and gains vs hfc?
never dynoed it or anything but the butt dyno says it def picked up power midrange and up top. low end seemed about the same. if i was to guess id say around 12-18hp range. the sound wasnt too much different maybe slightly louder but not by a whole lot. they def look nicer than the stock manifolds too.
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