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Header choice on a 4.7 MJ build
Posted: December 2nd, 2009, 11:06 am
by 1BADMUDR
alrighty, i am down to header choices and I still am confused as to which one flows the best. It seems the Borla 17039 has changed design and was no longer recomanded by Hesco. they suggested i look into the JBA1526S header. it seems this one has 1.5" primaries with a 2" collector. i have one coming next week just to take a look at it and see if it would work.
Does anybody have a good recomendation besides the junk APN headers. I just cant justify putting on an inferior product in a high fail rate application. I would rather utilize a brand I sell so warrantys are not a problem if needed. I would like to know what part numbers people are using for the split header design with two 2' collectors.
Re: Header choice on a 4.7 MJ build
Posted: December 2nd, 2009, 7:38 pm
by YJason
I run a Borla 17202 heat wrapped to the collectors into 2-2" pipes into a 3" pipe to a 50 series flomaster, then 2.5" out the back.
Re: Header choice on a 4.7 MJ build
Posted: December 3rd, 2009, 6:44 am
by 1BADMUDR
what vehicle do you have that header in?? is it a cherokee or comanche? I am curious about it fitting in my slammed MJ utilizing a 94 block and head witha 00 XJ intake.
Re: Header choice on a 4.7 MJ build
Posted: December 14th, 2009, 7:52 am
by seanyb505
Why are APN junk inferior products? Ive read more of borlas cracking and my APN has held up just fine for a few years now....
Re: Header choice on a 4.7 MJ build
Posted: December 14th, 2009, 5:34 pm
by YJason
1BADMUDR wrote:what vehicle do you have that header in?? is it a cherokee or comanche? I am curious about it fitting in my slammed MJ utilizing a 94 block and head witha 00 XJ intake.
Its in a YJ but they are short headers. They are made to have catalytic converts bolted to the bottom of them. I have mine running in front of the oil pan and doesn't hang any lower than the bottom of the oil pan.
Re: Header choice on a 4.7 MJ build
Posted: December 21st, 2009, 7:46 am
by lazybaka
where have you read about borla's cracking ?
Re: Header choice on a 4.7 MJ build
Posted: December 21st, 2009, 6:17 pm
by YJason
I've heard that the Borla headers that are similar to the factory headers crack in the same place near the collector.
Re: Header choice on a 4.7 MJ build
Posted: December 22nd, 2009, 12:10 am
by Cheromaniac
YJason wrote:I've heard that the Borla headers that are similar to the factory headers crack in the same place near the collector.
Some Borla headers have indeed cracked and a bad driver's side engine mount is often a contributing factor. I've had mine for 12 years and 156k miles with no problems.
Re: Header choice on a 4.7 MJ build
Posted: December 22nd, 2009, 7:35 am
by yuppiexj
A regular splashing of cold water during stream crossings tends to shorten the lifespan a bit.