What is available for the 3.7 other than air filters and cat back systems? I am thinking what my liberty needs is something to bring the torque down into a lower RPM range. On the older motors, it was things like swapping camshafts and intakes. I have tried some searches, on parts vendors and boards like this and found nothing so far. Would something like a catback really help bottom end, or is the gains pretty much in the higher RPM range? I put a gibson system on an S-10 several years back and it helped power and MPGs. I haven't read much on how these catback systems help out the libertys. I'd hate to spend a few hundred for just a loud exhaust. I realize this is a relatively new engine, and much more exotic than the 302 in my F100 or the 4.3 in the Jimmy I sold to buy the liberty. Just sort of hoping that might be some things out there I'm not aware of. Not try to rant or be negative, just hoping for something a little better.