Quote:
I have been intending to regear the axles to 5.14's to help - but now that I think about it some more, since 5.14 is ~10% higher than 4.6 that'll only bump the RPMs up to maybe 2-300 (if my math is right)... I don't think that's enough to make a difference.
Yeah, but the 10% difference is the same as the jump from stock 30" tires to 33" tires. So in essense, you'd be getting a shorter gear ratio than an equivalent stock Xterra...

That 10% makes a HUGE difference.

That being said, my truck (33's) was a dog w/ the stock 4.636 gears. But since I've put on headers, I don't have the constant OD annoyance that I used to. Even when towing my popup, only the big hills causes me to drop it out of OD.

I don't think adding cams w/o doing anything w/ the intake/exhaust is going to do much for you. Calmini's exhaust isn't a true cat-back, and the K&N drop-in filter is only giving you the ability to save $$, but not really doing anything for performance. Get the external upgrades done, first, then worry about internals.