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Discussion Starter #381
Jesus, you're having bad luck this year.
And I'm in the middle of troubleshooting my wife's B9 Tribeca overheating issue. It just doesn't end, it seems. Never had issues like this with my past Toyota cars. I maybe the few who actually cracked the new Killer B header. It's only been on the car for a year.

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Discussion Starter #382
And now, on to the crack show! After going back to the stock manifold, I can feel the power loss and turbo lag. The car is tuned for the header, though. After driving with the stock manifold, I think the car doesn't sound good. I want to put the header back on, after it gets repaired, of course.


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Discussion Starter #383
I did the spark plugs today. The plugs are fouled and has gap erosion. I finally installed the HKS spark plugs. Platinum ground with iridium tip in a 1 step colder heat range. Idle is smooth again. I don't like the noticeable drop in torque and high rpm power loss with the stock manifold.

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Discussion Starter #385
the good news is that the manifold is warrantied for life. Just call them and work out the details.
I had just sent the header back to Killer B yesterday. From what I had read on this forum and NASIOC, they had taken care of folks and stood by their products. I didn't think I was going to break this header. Lol

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I had just sent the header back to Killer B yesterday. From what I had read on this forum and NASIOC, they had taken care of folks and stood by their products. I didn't think I was going to break this header. Lol

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I've known of a few breaks. In the version 1's they happened and that was one reason they went to the version 2's.

And I've heard of some version 2's starting to crack at the merge of the collector.

But again they stand behind their products, so it is no worry aside form the turn around time.

Sparky
 

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Mine started cracking, unfortunately I wasn't the first owner. But for the price they charged me, it was a *KILLER* deal to replace it.
 

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I'm not intending to throw shade but cue talking straight out of my ass because I am no Materials Engineer.

During welding of 321 stainless loss of titanium is an issue. So maybe this is why they crack at the weld. But it is not solely due to the welds. If you seen videos of these headers in action you know the collector is an area of very high heat stress. AKA glowing bright orange which could indicate temps upwards of 900c (1650F which coincides with EGT's seen in hard runs). I know 321 is less prone to hot cracking due to the addition of the titanium, but with the loss of titanium during the weld process it "COULD" be the reason why they are cracking at the welds. Also 321 stainless does thermally expand more than 304 which doesn't help at those highly stressed areas.

Also Ethanol fuels(e85/e98) contain more chlorides than standard gasoline. From what I understand 321 doesn't like chlorides ions. Similarly to 304/304l stainless.

Straight arse talking but that is just what I have gathered from reading 321 spec sheets.

Maybe this sheds some potential reasons why they are usually cracking at the collector (at least from what I have seen). Maybe I am completely wrong.
 

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Discussion Starter #394
After running the stock exhaust manifold temporarily while waiting for the header to come back from Killer B, I was driving home from work and spun a rod bearing due to heavy detonation. This was on the stock manifold and tune made for the Killer B. I took it easy, but I guess that wasn't enough. So once everything is back together again, I am looking to sell my STI. 😭

Sucks when it hits ya hard. Not only my car, but also my wife's B9 Tribeca has a blown head gasket. This will most likely be my last Subarus I will buy. They were my first.

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Man, I'm sorry you had to go through that. I am also wondering if it might be something else as well. Reading through your journal, this is the 3rd time you've had serious engine failure, and I'm wondering if maybe it has to do with the builder/tune?
 

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After running the stock exhaust manifold temporarily while waiting for the header to come back from Killer B, I was driving home from work and spun a rod bearing due to heavy detonation. This was on the stock manifold and tune made for the Killer B. I took it easy, but I guess that wasn't enough. So once everything is back together again, I am looking to sell my STI. 😭

Sucks when it hits ya hard. Not only my car, but also my wife's B9 Tribeca has a blown head gasket. This will most likely be my last Subarus I will buy. They were my first.

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Looks to becoming a trend around here.
 

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Discussion Starter #400
I should get the car back tomorrow. The weird thing is, I'm not all that thrilled. I recently bought a brand new VW Atlas. Though it is nowhere near as quick and powerful than my STI, I enjoy sitting in it more as it feels upscale and fancy. I have been driving Japanese cars for a long time and driving a VW to me feels like driving a more expensive car. I bought the 08 due to it being able to be more convenient than a sedan. I don't want to give that up. Perhaps a Mercedes GLA 45 AMG or an Audi Allroad could be my future car.

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