Kyle42

I have a 92 4.0L and am interested in purchasing some performance headers. I am wondering what the best options would be and where to get them. I've been looking at Gibson, Banks, and a few others.

xPlover24x

Rustys are cheapest

98jeepsrt6

ive got pacesetter headers on mine with true dual exhaust.. dual isnt necessary but i like being different...02c

xPlover24x

The Rusty's will work perfect because the pressure in the headers needs to be correct if you want to get a good burn continuously. it all has to do with the firing order. they dont just go down the line to fire so dont buy headers that are all equal length tubes. the straighter the pipes does not necessarily mean the more power. back pressure is key for injected engines so be cautious before spending that kind of money. look at some of the reviews my professionals and not customers. good luck

98jeepsrt6

NOt here to discredit you but this is not necessarily true.. My vehicle is proof

xPlover24x

if there isnt enough or too much pressure then some of the hot, used gas will stay in the combustion chamber resulting in an incomplete burn

xPlover24x

Borla has a good one that i just read about

xjrev10

i've heard the BANKS is not worth the extra money, unless you like the free cool sticker they send with it

xPlover24x

Banks is much better at intakes

Kyle42

Where would I find professional reviews?

xPlover24x

google

98jeepsrt6

I agree but that has more to do with the exhaust piping rather than headers.. anything larger than 2.5 is unnecessary.

1991Jeep_Man

I wish this myth would die. All Jeep Cherokees with Fuel Injection have computers that monitor air pressure, temp, fuel, etc. The reason people keep bringing up back-pressure is because OLD carb systems needed it to prevent lean burning because they couldn't adjust fuel ratio to an increase of air in the combustion chamber. Reminder this was on OLD CARB SYSTEMS. All of our XJ's CPUs constantly monitor whether or not our engine begins running lean, and quickly adjusts the fuel ratio to correct it.

Conclusion: BACK PRESSURE IS NOT NEAR AS IMPORTANT AS EVERYONE KEEPS MAKING IT OUT TO BE FOR FUEL INJECTED SYSTEMS.

TheJerm

Header - i run this one and they warrenty is pretty good. They replaced mine cause i was dump and didnt put my bump stop back in.

Back pressure isnt really that important, if it was ppl wouldnt run cut outs on their souped up cars.

xPlover24x

you would think but its all started in the header. if you look at your stock header its cast iron. not good for performance. the reason for it being cast is just because its a lot cheaper. the header tubes should almost mimic the firing order. the reason is so the exhaust "puffs" of you will dont all run out at once. the different sized tubes actually draws that hot gas out to clear the chamber. its all done for a reason. the reason for race headers being as straight as possible is to get as least resistance as possible by not curving around the pipe. SCIENCE!