Just completed the Crios mod a few hours ago in my garage since the weather was bad. I did not jack up the car so I did not have a good position and my holes are a 1/4" off(one is higher or lower than the other). I made one hole on each side, a little bigger than 1/2", maybe 3/4". I started the car and it sounds a little louder but I didn't drive it yet, my wife's Jag was in my way and I didn't feel like playing revolving cars. She's not too happy because since I got my Box, her car has been outside. I have a 66 Mustang taking up the other side of the garage which has to go so that she can have room for her car. Oh well, what can you do. lol
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