Pics of dual cutouts
#5
If you haven't driven an ls1 with open headers before, I would suggest you do that before putting them there. It is VERY loud and everything vibrates and shakes. Not much fun if you ask me.
#6
http://www.youtube.com/watch?v=f2cFNy3J03U
Turn this up to full blast on your computer and it will be about 1/10th of how loud it really was
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#10