Headers on 3.7L
- Thread starter Okura_hubby
- Start date
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tjkj2002
Full Access Member
- Joined
- Dec 17, 2006
- Messages
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If you want them for mpg's yes they are horrible,for power(with less mpg's) and the correct PCM programming they are very good.Sadly though unless you find a used set or someplace with some on the shelf still your not getting any as JBA stopped making them due to no demand which also was the reason for the $500+ cost.
Okura_hubby
Full Access Member
Before I went off the crazy end and put them on I was getting 15.5.. Right now, um I am get 12.8. I just had all the fluids changed, new air filter, forced ram air intake, and new plugs. No noticable problem in how it runs. The B&G chip should be here this week.
When I put the headers on, I think I didnt get the collector bolt tight enough and it was leaking. Had the local **** shop replace the bolt and nut. But with it leaking, on the highway I got 19.8 MPG. I am hoping with the new forced air intake, and tightened bolts, and new chip I will be mid 20's.
If your sole goal is MPG. Just say NO.
The link I posted originaly had the headers for sale if anyone wanted them.
When I put the headers on, I think I didnt get the collector bolt tight enough and it was leaking. Had the local **** shop replace the bolt and nut. But with it leaking, on the highway I got 19.8 MPG. I am hoping with the new forced air intake, and tightened bolts, and new chip I will be mid 20's.
If your sole goal is MPG. Just say NO.
The link I posted originaly had the headers for sale if anyone wanted them.
Kasmir Jones
Full Access Member
My MPH's didn't change much...But I also removed the all the stock cats and replaced them with one magna flow. I have more of a back pressure issue. Keep Us posted on the B&G. I thought with them you had to send them your PCM?
Xodius
Full Access Member
...what year is your KJ? Didnt you have 3 and if so how do you pass smog and not have engine lights? I ask because my 02 has 3 of the SOBs and I have been told time and time again I have to keep 3.
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Kasmir Jones
Full Access Member
Its an '03. Didn't have to pass inspection yet(but i'm dreading it, although the 360 Modena smells a lot worse). The shop that did the exhaust, put back the o2 sensors. One before and one after the cat. On occasions i do get a check engine light. I put my scanner on it a I get a o2 code. But get this it goes off on its own after a day. I have had the exhaust on for about 7000 miles, its gone on 3 times.
Nascar-ta
New Member
OK Next question How about Cat Back exhaust On the KJ. Any improvement either way gas or performance?
