No personal experience but I've heard good things about Borla and banksdvogel11 said:Hey guys, I have a 99 tj 4.0 and Im looking to buy headers for performance and sound reasons. Any tips? anyone selling? Things to avoid?
Thanks for the help
The revolver is what I had in mind but couldn't remember the name. Never heard of Borla cracking thoughJerry Bransford said:Your TJ 4.0L did not come with an exhaust manifold if that's what you're thinking, it came with headers right from the factory.
Both Banks and Borla have earned reputations for their 4.0L headers cracking for the same reason the early TJ's headers cracked... engine torque flexing them. Jeep fixed the problem with the OE headers by adding a pair of steel flex joints where they were cracking but neither Banks nor Borla have bothered to do the same on their standard headers. Banks finally came out with their Revolver header that is supposed to be crack resistant but I sure wouldn't replace your OE header with one unless what you have is cracked and in need of replacement.
What year TJ and when were those replacements installed?one set of factory headers per year for 3 years all cracked, got tired of paying the labor for the parts were free, put a borla header on an wow felt more response and a deep growl, that was 6 years ago, no crack in mine yet, million mile warranty, been in 100 to 10 degree weather, should of done it right away.
Early '99 headers did not have the flex joints, that upgrade came later in the '99 model year. My dealer replaced my '97 TJ's cracked headers twice under warranty with the original non-flex joint version so I had three headers in a row that cracked. Then my dealer replaced it again but with the updated header in late '99 that had the flex joints and it worked fine without cracking for the next 11 years and 160K miles. The new version header was fine the last time I saw that TJ when it was stolen in 2010.is the OEM now fitted with a flex portion to stop the tendency to crack?
or do I need to go with a later OEM, ??
I have a cracked exhaust manifold to replace.
My jeep is a 99...assuming the original owner never replaced the headers, that means my jeep got 11 years and 84000 miles out of the stock set.the oem with the flex portion crack but not there, dont waste your time withone, do a banks or borla, or do it again a year later.
I bought the Banks before I found this forum and knew any better. I got sucked into the marketing:doh: If I had it to do over again, I would have gone the cheap route and bought the stock replacements with the flex joints. My jeep came from the factory with them...but after 11 years finally cracked.Both Banks and Borla are well known for cracked headers on the 4.0L. Banks had to come out with the beefed up Revolver design to stop from cracking. For what they cost I would sure just go with the updated factory design with the pair of flex joints... they are well known to hold up fine.
Notice the "crinkled" part of the header that looks like it could flex. However, if u are not experiencing an exhaust leak (annoying tick) then I don't see why u would need to change anything.Kill The Infidel said:Uh, how do you tell if you have flex joints. I am taking my 97 on a long road trip in march and am trying to bullet proof and fix any problems that could arise. I was looking at a header because I hear they crack
That is the philosophy that I live by too. I was looking to swap it out for a little more power, but if I run the risk of messing up a good thing, im not gonna worry about itCons_Table said:Notice the "crinkled" part of the header that looks like it could flex. However, if u are not experiencing an exhaust leak (annoying tick) then I don't see why u would need to change anything.