Im sure quiet a few of the guys on here could vouch that my car non-res jcw back box certainly wasnt quiet. If you look up nms easter run there is a video of all the cars going by my ds r56 (pre decat) and Ian's blue r56 are on it as well as quite a few other r56s including a gp. Would be worth a watch to get an idea of the different sounds. If i cant find it i will get the link up

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https://youtu.be/75h4-eLXeMA

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Andrew's r56s withe challenge rear is in the video as well