I was one of the first ones to have the Gruppe-S header, and I'm still really happy with mine. Been used on my supercharged setup even for the past few months-no regrets
[ame="https://www.youtube.com/watch?v=FSaQRZ6RMKc"]Gruppe S Unequal Length Header (UEL) FRS/BRZ Comparison - YouTube[/ame]
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