3.7 Header

[daniel]

OH! I didnt know that. Cool, now if they would just come down off that price ide be even more interested....

[6pack]

Thanks for the torque diagram, pup!

Yes, there are two O2 sensor bungs now. Let see if I can get a pic to post...





Okay, big, but there they are.

And, yea, the price is rough. You definitely need to have spare cash for this one.

[trailerpup]

Build quality still looks good. 2nd bung should solve the engine light.

[daniel]

please keep us updated with that dual bung manifold. If there is no SES lights and theres a noticable increase in power, i just might take the plunge...

[6pack]

I'm getting ready to go tackle it now, I'll update when I'm done with pics and problems.

[6pack]

O2 sensors are being a pain. I just lubed them down with WD-40 and am giving them a few minutes to soak. The heat shield is in the way and keeping me from getting a good angle at them, too.

[daniel]

Im sorry 6pack, where from and how much did you got it again?

[6pack]

Daniel, I got it off eBay, about $930 including shipping. The company that made it is listed as KPE with the seller's name azmxrider.

Okay, deconstruction phase is complete. Exhaust manifold is out and I'm taking a lunch break. O2 sensors came off without a problem after soaking for a bit, same with the three bolts at the bottom of the manifold where it connects to the rest of the exhaust. I didn't have as bad a time getting the manifold out as it sounds like you did, pup. I did pull the heater hoses off at the firewall. They seemed to be what was in the way. I wish I had thought to have something to plug them when I pulled them off, but not to much coolant leaked, maybe a tablespoon or two.

Okay, finish eating and back at it!

[trailerpup]

[6pack]

Done! This will have a bunch of pics, sorry if there's anyone still on dialup. I'll write descriptions beneath each pic.


This is the area destined for the new steel.

The offending party hiding beneath its heat shield.

The nice and rusty bolts at the bottom of the manifold connecting to the rest of the exhaust.

The start of the deconstruction. K&N air filter and pipe out.

The EGR assembly removed and just set up on top the engine. I ended up removing the other K&N pipe when I was pulling the manifold out.

Heat shield and offending manifold OUT.

Quite a difference.

The O2 sensors seem to be in slightly different locations...

Header view from the bottom with the three bolts tightened up and the O2 sensor in. No problem with the bottom sensor.

But the top O2 sensor is in a different spot. The top sensor can not reach the top bung while the wiring harness is clipped on the engine. I had to pull it off the clip, then run the harness behind the heater hoses to keep it away from the header.

The header is in! Isn't she purdy?

The EGR and K&N hooked back up.

Completed work viewed from the top.

All in all, not a bad project. I sliced my fingers up on those damn stock gaskets. They're paper thin metal. And I think I have a stripped bolt, the top rear one. That's frustrating because I had her at the dealer back around June because the manifold was leaking. They said I had two broken bolts and two stripped ones and they needed to re-tap the holes. Well, I guess they didn't do a good job on the one. And the ass doing the work didn't even replace the bolts with all stock ones. I have two that are generic 15mm ones rather than the stock 13mm ones. When I get the stripped bolt fixed, I'll probably replace those two also.

The only thing that delayed me was waiting for the WD-40 to help loosen the O2 sensors and the bottom three bolts... and lunch and some breaks for drinks. And I had a bit of an issue while I was trying to get the header on because I was trying to install it with the gasket backwards. Total install time was about five hours, realistic time was probably half that.

Things removed to get the manifold out: Air filter system; EGR; Heater hoses.

As far as the performance... it's hard to say. I took it for a quick drive but couldn't really tell much of a difference. I'll need to drive it for a few days and see how it does, along with checking the gas mileage over the next few months.

For some weird reason, when I started her up for my drive, I had an error on my gauge cluster that said the stability track system was malfunctioning. I stopped while I was out and when I got back in and started her up, the error was gone. Not sure what that was about. But no codes about the O2 sensors.

Another project down. Now, how long until those shock plates come in?

[Hunner]

PB Blaster should be in your future!

[daniel]

$1,000ish and cant tell much difference? Eh, ill wait a bit and see if that changes cause i dont like that sound of this already lol. Nice looking piece though. Does it come in black?

[trailerpup]

It only comes in stainless. And, it's a header not a supercharger. One more piece to making the 3.7 as efficient as possible. It is for an H3 not for a vehicle that has been produced for years with a plethora of aftermarket parts to choose from. Using your argument one could say that the Thor or ARB bumpers are "overpriced." Using your logic most H3 aftermarket products would fail to meet your standards. I give 6pack a lot of credit for doing what he wants to with his rig. He's had the thing on for less than day. Give it a break. Yeah, the header is spendy. But if you want to play...

[daniel]

It only comes in stainless. And, it's a header not a supercharger. One more piece to making the 3.7 as efficient as possible. It is for an H3 not for a vehicle that has been produced for years with a plethora of aftermarket parts to choose from. Using your argument one could say that the Thor or ARB bumpers are "overpriced." Using your logic most H3 aftermarket products would fail to meet your standards. I give 6pack a lot of credit for doing what he wants to with his rig. He's had the thing on for less than day. Give it a break. Yeah, the header is spendy. But if you want to play...

EASY! Kick back. Im not arguing anything and im not rag'n on the guy for it. What anyone does with thier truck and or money is thier business. But ive done couple of "header" mods on a few other vehicles i have owned and its not something you "cant tell the diff with". Either you have the extra power right there and you can tell right now or not. It isnt a set of tires and they work good on the street and "ill see how they wear". Its a performance mod. Yes, you are right, im sure somewhere on a dyno youll see 10-15hp but not where you need it, and if you dont get that "seat of the pants gain" then i dont think you gain anything. Trust me, ive been there as well, dump a ton of cash and expect a lot of go and you get very little. So more power to you and him and anyone else who wants to go ahead with that project. But im just stating that for $1k and no seat of the pants feel, then he did me a favor. I know the result now and i know not to buy one. Also, yes there are plenty of "overpriced" mods out there. I mean crap look at my complete Gobi setup. That cost me ALOT of money. More then i honestly should have spent but it was worth it and does its job. And i happen to think it looks really nice as well. I mean whatever man, do what you want, im just giving my opinion here. Last time i checked, that what these forums are for.

[trailerpup]

Sorry, my bad.

"Eh, ill wait a bit and see if that changes cause i dont like that sound of this already lol."

...statement makes it sound like you are laughing your A$$ off at the guy. No?