Its most likely not an exhaust leak. Exhaust leaks sound very different than our engine hiss, and are very prominent. I dont really now how to explain that sound other than you would know the difference had you heard it; you would think your engine was broken. Its just hiss, and as far as I know, no one really knows what causes it or why its so prominent. My guess? VVEL. Just about everything weird or quirky about our engines all seems to stem from that.
As for the headers, I like them. A few friends have complimented the sound of my just driving around in light loads crusing, and the sound at WOT under full load combined with the intake is freaking loud, but sounds good. Power wise, its about the same as TP's. The TP and LTH perform very similar with only a few HP/TQ in the LTH's favor. I would hazard a guess that once some way to tune valve lift duration and overlap, we will see more benefit from NA and more notably FI aplications.
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