An UEL header will ultimately make a bit less power, but it will be "more fun" on the street as the power is shifted down the power band and the torque dip is eliminated. The PTuning and Tomei EL headers are fantastic, but they aren't as fun to drive on the street unless you rev out every shift and the torque dip will still be there at least to some degree. If this is primiarly a DD, I strongly suggest a UEL header.
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