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Originally Posted by ChipR4cam
JLT may be the worst looking, and just "PVC pipe" but from what I've seen they work better than anything else on n/a 4v's.
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You asked what made more power, not what looked best. Mine looks like black PVC, too, but I picked up a pound and a half of boost and I've seen dyno graphs proving they're worth 25 rwhp on a '03/'04 Cobra, which is consistent with my dyno graph.