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The stock front pipe is the best at controling DB and rasp. With an off the shelf tune there likely won't be much of a difference in terms of power going to a HFC FP.
Gruppe-s OP is identical to the Tomei. I run the gruppe-s header + OP and I am satisfied with quality and fitment.
Ft86MS are local to me. Their FP/OP combo is relatively new but I've heard good things about it.
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