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As to the sound vs. desnorkeling; I'd say the sound benefit from the desnokel seems to be the same and it seems like I hear it from the driver side vent not the exhaust pipe itself. I have EVO intake and no snorkel. The headers seemed to have changed the actual exhaust sound in a minor way, though I do hear a difference, and I do like it; though it is subtle. The actually throttle response seems to have improved a bit, especially at the low end. By that I mean it revs easier under load and at very low RPMs it is easier to modulate. That is what I notice more than the sight change in sound. Day 2 and I'm still happy with the upgrade.
After more research on this forum yesterday afternoon I found the link for the Durametric software. I think I will go that route if the CEL comes on.
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