Even "ported", you'll still be down 15-20 hp or so w/ the manifolds vs. headers.
GOOD headers don't leak. I've had issues w/ every set of Hooker headers I've run, but not TTI.
The X pipe makes power, no denying that, but the sound changes w/ it. It gives a higher pitched sound to the exhaust. Personally I don't like the way they sound, but a lot do.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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