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So far my JDL 4-2-1 is performing just fine. Welds, fitment is all on point. Took some time to get it but I understand that these are made to order items.
Overpipe is a good while you are in there piece. I've data logged a bunch with my gruppe-s OP with my tuner and will be upgrading soon to a slightly larger 2.5" OP. I'll be curious if the logs indicate any difference. Personally I doubt it but who knows.
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