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I've got the Gruppe-s header, so a recommendation from me-I was one of the first to get it on too, and have had no issues with it!
[ame="https://www.youtube.com/watch?v=nPZI8vBTdrw"]Scion FRS UEL Headers - Gruppe-S & Ark Grip Catback-Start and Rev's - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=FSaQRZ6RMKc"]Gruppe S Unequal Length Header (UEL) FRS/BRZ Comparison - YouTube[/ame]
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