The drop in K&N will give you a slight increase. The K&N or AEM cone setups will add just a little more, unless you do a "$4 cold air intake modification" which will give an increase above around 35 mph. Adding a Profinish-Proglass hood will add considerably more power to the cone intakes. The Fastman throttle body provides a nice improvement to the throttle response, and a noticeable increase in power. The catback exhausts seem to make a nice difference in power, but I only have experience with the Borla dual outlet. I really like it. The fit is perfect, it sounds great, and the power increase was definately noticeable. It's not too free flowing to make you lose low end torque though. Currently there are no headers available for the 3.7. JBA has made the prototypes, but they are awaiting CARB approval. The B&G flash will delete your torque management, increase your timing, tighten up your shifts, and adjust your fuel curves. It's necessary to get everything working together well. Going to 4.10 gears will give you a noticeable increase in acceleration and power off the line, but they will cost you at high speeds. If you have an early KJ with the 45RFE transmission, the APS Precision custom torque converters really help. I had them make mine with a 2500 rpm stall and a 2.53 multiplier. If you're looking for towing or crawling, you'll probably want a lower stall. You can also get the Transgo performance shift kit from them. It makes it shift much faster. It actually feels like it is surging forward on WOT shifts. Really cool. It also increases the line pressure and helps it lock up a lot better.
_________________ June 2001 Liberty Limited 4X4
Frankenlift II Premium, Al's Upper Arms, 245/75R16 C Silent Armors on Moabs, RL Skink Super Sliders, Rear DTT, Riddler Diff Cover, Fastman Throttle Body, Profinish-Proglass Hood, Borla Dual Outlet Exhaust, TransGo Reprogramming Kit, APS Stall Converter, 4.10 Gears, B&G Chrysler PCM, Lots of Line-X, etc...
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