I have been doing a lot of research on air induction systems for the KJ, not only on this forum but also on Jeep Forum and JeepKJ Country. I am looking to improve my fuel economy and gain horsepower; I know you cannot have your cake and eat it too. I am not looking for HUGE improvements or gains, but everything helps! I do plan on modifying my exhaust also to help achieve what I am looking for. I have the AEM V2 Dual Chamber Intake System and the Injen HydroShield Pre-Filter installed on my Acura CL and absolutely love this set-up! I would like to install a cold air intake on my KJ, but it appears no company makes a true cold air intake for it. The closest thing to a true cold air intake that I discovered was long_tall_texan's LTT True Cold Air Intake for KJ's [
http://tiny.cc/15v5o]. I do not want to go with an off-brand company intake (e.g. the ones found only on eBay). Thus, I am considering the following intakes: K&N 57 Series FIPK (57-1540) [
http://tiny.cc/v4dm9], K&N 77 Series (77-1540KP) [
http://tiny.cc/mijw3], and AEM Brute Force (21-8309DP) [
http://tiny.cc/ec3dp]. I will probably install an Injen HydroShield Pre-Filter [
http://tiny.cc/es2ou] on my KJ's intake. I am also considering just using the factory air box and installing a K&N Panel Air Filter (33-2233) [
http://tiny.cc/rn3g7].
Since I have experienced an AEM intake, I would like to try another manufacturer [K&N] to see how they compare. The 57 Series FIPK MSRP is $266.99 and the 77 Series MSRP is $349.99. Although the 77 Series costs more, I believe the 57 Series FIPK offers more benefits. The 57 Series FIPK's estimated horsepower gain is 6.36 HP at 5,274 RPM vs. the 77 Series' 5.92 HP at 4,054 RPM. Also, the 57 Series FIPK uses a crosslink nylon intake tube that provides cooler air than a metal intake, which is what the 77 Series is composed of. With this information,
why does the 77 Series cost $83 more than the 57 Series FIPK but offer less benefits? Which air induction set-up would provide me with the best fuel economy improvement and horsepower gain? Does anyone have either of these set-ups installed on their KJ? If so, how do you like it? Thanks in advance for you help!