Header For 89 Comanche?

[Antarctico]

My Comanche is an '89 4.0L RWD automatic with the six-foot bed. It's finally time to replace the exhaust system of my truck, and I've been wanting to replace the cracked stock manifold with a header for a while. Any suggestions?

 

Borla offers a header for my year and model (Borla p/n 17010), but they only spec it for a manual transmission truck. Anyone familer enough with this header to be able to tell me if it might fit a truck with an automatic, or if not why?

 

Thanks! :)

[rejeep]

it will fit, but pe prepared to run into problems with the trans linkage.

[GirsMJ86]

i just looked at their site and it has headers for all styles of MJs from what i saw.

 

alex

[Antarctico]

it will fit, but pe prepared to run into problems with the trans linkage.

 

Ah, now that makes some sense. Is the interference from the header itself or the crossover pipe that goes across the top of the trans?

[rejeep]

I'm actually not sure... but they have the same disclaimer for all auto jeeps and the 4.0 or 258...

[onetallmj]

Which ever one ( Banks or Borla i can't remember) comes with the crossover pipe - is the one I put in my truck and it fits fine with my auto, bolted right up

 

Wade

[comanchedude]

I can’t understand what difference it would make if its auto or std

If it supports stock exhaust then there should be no difference as the stock exhaust is the same for auto or std

Call them and ask...prolly fits either way

[Kernel]

i have the borla on my '87 xj should fit the mj no prob.

 

put a banks on the mj and it's just a stock replacement. didn't get the down pipe and it just bolted right up to my stock one.

 

shouldn't have any prob with linkage that's what the cross-over is for.

[pingpong]

I don't want to bag on anyone running a header, but they are only marginally better then the later model stock manifolds that you can pick up at the j-yards for 20 bucks. :dunno: Plus if you are running a header into your stock down pipe whats the benefit :huh???:

[DirtyComanche]

Are these guys talking shorty headers, not longtubes?

 

 

Then I agree with Pat. Spend your money elsewhere.

 

 

I'm so tempted to try making my own longtube header with a pipe bender. (That harbor freight special one that costs $99) Like everything else, I'd save money but it'll take me 3 weeks...

[onetallmj]

I don't want to bag on anyone running a header, but they are only marginally better then the later stock manifolds that you can pick up at the j-yards for 20 bucks. :dunno: Plus if you are running a header into your stock down pipe whats the benefit :huh???:

 

my experience and searching has led me to believe the stock manifolds are prone to ing and rusting away. my borla header is stainless and has a million mile warranty on it so i will never have to buy another one again. not so much performance as longevity.

 

just my .02 cents(not sense LOL)

 

Wade

[pingpong]

Mine cracked one time, and I welded it myself, and that was 3 yrs ago :eek: No issues since then :D So I really can't see spending money on something just cause it "MIGHT" break :dunno: Also if you go to the pick-a-parts they are only 20 bucks, and It is much easier and cheaper to keep a few spare around then it is to spend 400 bucks and hope it doesn't break again. :shake: cause if it does then you have to go through the retailer, then back to the manufacturer, and hope they don't have the clause where it has to be professionally installed for them to honor it. :deal: So then not only are you out 400 bucks, and aggravated, you need to spend more money :eek: Not what I want to do :brows:

[Kernel]

I don't want to bag on anyone running a header, but they are only marginally better then the later model stock manifolds that you can pick up at the j-yards for 20 bucks. :dunno: Plus if you are running a header into your stock down pipe whats the benefit :huh???:

your right.

 

the borla header is a true header with down pipe. gives a little more power.

 

the banks is a stock replacement. no power gain but better quality than stock.

 

i know the borla should last the life of the rig with "million mile warranty".

 

i'm sure if the banks takes a s*&t they will replace it.

 

you can save your money on a stock one but why shovel more crap into your rig.

 

my .02 :cheers:

 

edit: i have 2 stock exhaust manifold you can have if you want to reweld them. :D

[Kernel]

Mine cracked one time, and I welded it myself, and that was 3 yrs ago :eek: No issues since then :D So I really can't see spending money on something just cause it "MIGHT" break :dunno: Also if you go to the pick-a-parts they are only 20 bucks, and It is much easier and cheaper to keep a few spare around then it is to spend 400 bucks and hope it doesn't break again. :shake: cause if it does then you have to go through the retailer, then back to the manufacturer, and hope they don't have the clause where it has to be professionally installed for them to honor it. :deal: So then not only are you out 400 bucks, and aggravated, you need to spend more money :eek: Not what I want to do :brows:

you could say this about every after market product you buy. :roll:

[pingpong]

Thats why if you ask anyone what performanse mods I have done to my rig... :deal: :agree: The answer is none :eek: All you need is more gearing, and stronger axles :brows: Also ask them what is covered and what isnt in the event of breakage :brows: LIke the Yukon axles, if the u-joint breaks, or the ears on the shafts breaks, no coverage, but if the shaft itselfs shears, full reaplcement ;) Always read the fine print. I think it was a Doug Thorley header that cracked on a guy a while back over on JF, and because it was not professionally installed, no warranty existed :eek:

[Antarctico]

I can’t understand what difference it would make if its auto or std

If it supports stock exhaust then there should be no difference as the stock exhaust is the same for auto or std

Call them and ask...prolly fits either way

 

I called Borla and talked to a fellow named David. He says because the header was built for a truck with a manual trans, and because the automatic is a bigger unit than the manual, this is why it won't fit. I think this sounds a bit like BS to me, I doubt he had anymore familiarity with the header than spec sheet he had in front of him, but I've never had the chance to compare the dimensions of the manual vs. automatic. The header uses its own crossover pipe, so maybe this is where there is an issue.

 

Borla has a header for the '91 Comanche/Cherokee that works with either transmission, but it does not have an EGR port like the header for the older motors. Unfortunately, I live in a state that uses a dyno for its emissions test, and that means having to worry about stuff like this if you want to pass.

[Antarctico]

I don't want to bag on anyone running a header, but they are only marginally better then the later model stock manifolds that you can pick up at the j-yards for 20 bucks. :dunno: Plus if you are running a header into your stock down pipe whats the benefit :huh???:

 

I need to replace the whole system -- my mainfold is cracked in the usual place these things brake, my catalytic converter is shot, and the muffler has a hole in it big enough to put three fingers through. What I am shooting for is the header, a Random Technology high-flow cat, and a Flowmaster 50 Delta Flow (for the nice sound).

 

I know it's kind of silly to be spending any sort of money on a old truck like mine, but hey, it's my truck. :)

[Kernel]

I can’t understand what difference it would make if its auto or std

If it supports stock exhaust then there should be no difference as the stock exhaust is the same for auto or std

Call them and ask...prolly fits either way

 

I called Borla and talked to a fellow named David. He says because the header was built for a truck with a manual trans, and because the automatic is a bigger unit than the manual, this is why it won't fit. I think this sounds a bit like BS to me, I doubt he had anymore familiarity with the header than spec sheet he had in front of him, but I've never had the chance to compare the dimensions of the manual vs. automatic. The header uses its own crossover pipe, so maybe this is where there is an issue.

 

Borla has a header for the '91 Comanche/Cherokee that works with either transmission, but it does not have an EGR port like the header for the older motors. Unfortunately, I live in a state that uses a dyno for its emissions test, and that means having to worry about stuff like this if you want to pass.

i have to call bs on this too. my '87 is an auto... i did buy mine 5-6ys ago. i'll try to find the part# for the one i have.

 

i also bought the cat back at the same time. sill have the muffler & pipe but the end is hanging in the garage. just figure it's wall art for the garage. :D

 

edit: my brain keeps on flashbacking. when i bought mine it came with 2 diff gaskets. even in the distraction they said to make sure to use the right gasket. pre/post '91.

[Kernel]

I can’t understand what

 

Borla has a header for the '91 Comanche/Cherokee that works with either transmission, but it does not have an EGR port like the header for the older motors. Unfortunately, I live in a state that uses a dyno for its emissions test, and that means having to worry about stuff like this if you want to pass.

this here might be your down fall. if they stopped making the bung hole.

[pingpong]

I have a few old style manifolds in my gareage :D I don't know what the shipping would be, but I will sell you one for 30 bucks plus shipping. I have "heard" of ppl using the late model intakes, with late model exhaust to get around the problem of the EGR bung. :brows: just make sure it isnt a HO model intake ;)