Hi everyone! I bought a blue 04 kj limited 4wd a few weeks ago. It had 147,800 miles on it, no engine lights on, no dents, paint only fading on roof. The lights on the AC panel don't work, and one of the windows was worked on and doesn't have a roll-up limiter (or whatever) so it hits the top and makes that distinct grinding noise when the switch is pressed after that point. Also, when it is in drive, stopped on a hill, it rolls back as if it were in neutral. Every other car I had would actually keep pushing uphill slightly unless I applied brakes, so I'm concerned about that. Aside from those things, a broken wheel stud, and a faulty tpms sensor, the jeep seems fine. I bought it from a couple in Marietta GA for $3050. The girl's father bought it at 91k miles and it was driven by her until 147k. I wanted to buy a more powerful 2003 Nissan Pathfinder, but that guy was out of town for a while and I wanted an SUV ASAP before I spent any more money on my 24 year old 242k mile Nissan Maxima. Did I get a good deal on the Jeep? Is the roll back issue normal? AC panel bulb, fuse, or wiring? I just had the last recall done, but are there any major services/repairs/failures I should expect between now and 200k miles? (I do regular synthetic oil&filter changes, and will be flushing coolant and ATF fluid here soon) What about diff fluid? Next, I have upgrade questions since I didn't get the 240hp 265 ft/lb torque Pathfinder that I wanted. I read up on adding exhaust headers and a performance exhaust, and there is lack of clarity on the matter. First, I am aware that any HP gains would be minimal, but if I could get 10-20 hp and 10-20 ft/lbs torque, that would be neat! There are guys out there, like Scotty Kilmer, that say that increasing airflow could throw off the stock ECM and actually make things worse. Other guys claim adding performance exhaust headers results in more power/torque that was noticeable going uphill in 4th gear. Yet more claim similar results (including better MPG) from a performance exhaust. Does anyone have actual dyno results from this stuff? I suppose the issue concerns the ECM and whether or not additional steps must be taken to properly turn that new airflow into consistent power gains. I just don't want to spend $900 on wishful thinking. This is my first time on an Internet forum, so help me learn! I look forward to hearing from you more experienced and wise members, and I hope to contribute to the forum myself as I learn and do more with my jeep. Thanks!