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Old 08-02-2006, 09:51 PM   #1
Kostamojen
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Question Anyone trying to fit the 06 Equal length headers on a previous model yet?

As the title states, I was curious if anyone has tried to fit the new '06 equal length headers and redesigned exhaust onto an older model N/A car.

I know it requries the new oil pan as well, but I am curious about the possible power-band and hp changes by using this exhaust after I noticed it on an 06 today (ya, for some reason I havent noticed it before I fell out of the loop on this one). I'm also curious if that oil pan is a bolt on or if it only works with the 2.5i shortblock.

For DIY purposes, using that stock header seems like an interesting possibility, since you could either have a custom exhaust made from the flange after the first cat (I wonder what the ID is for that flange) or even just cut off that first cat and use the equal length 4-1 collector as a base for a custom exhaust...

Anyway, just curious...
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Old 08-02-2006, 10:14 PM   #2
SubaruDriver502
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me too. I was also wondering if a sti long block would be able to be built up as a hybrid and drop into the 06 impreza (I think it would due to the variable valve timing). I want to build a hybrid motor once I get my 2.5i. I want to have a hard core N/A motor that could be boosted in for future times.

Anyways my guess is that the oil pan would bolt onto an older EJ motor just because that's how subarus are. But I would rather get aftermarket headers for an RS anyway.
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Old 08-03-2006, 02:07 AM   #3
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Quote:
Originally Posted by SubaruDriver502
I want to build a hybrid motor once I get my 2.5i. I want to have a hard core N/A motor that could be boosted in for future times.
But a hardcore NA engine = high compression, which is no good for a boosted future as you mentioned. If you swap in the EJ257 block, you will have a low compression NA engine that would probably be slower than the stock 2.5i.
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Old 08-03-2006, 01:51 PM   #4
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I dont see why not. I was at the dealer the other day and a tech an i were debating this while looking at an 062.5i on the lift. The crossmembers looked similar, the only thing would be having to change the oil pan to the new style. THis might be a project that i want to take up. i assume i can get someones used manifolds cheaper than i can get an obx header off ebay. i just migh have to try this.
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Old 08-03-2006, 07:57 PM   #5
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i dont get why go through all that, when you can simply just get a set of obx/rallitek/cobb headers and they will flow better and make more power than all the damn work youd have to go through rippin the oil pan off
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Old 08-03-2006, 08:30 PM   #6
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I've thought about using this header since (1) I have the '06 oilpan anyway, and (2) I want to keep a factory look so people don't start looking for other (illegal) mods. Oh, and (3) because the '06 header is heavy, insulated and heat-shielded... and thus quiet. The one reason I haven't put aftermarket EL headers on my car is the extra noise.
BTW, the alloy oil pan on the '06 interferes with the crossmember on a GC. I had to cut a little bit of the pan away and shim the engine mounts a little.
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Old 08-03-2006, 08:59 PM   #7
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Quote:
Originally Posted by piker28
i dont get why go through all that, when you can simply just get a set of obx/rallitek/cobb headers and they will flow better and make more power than all the damn work youd have to go through rippin the oil pan off
Oil pans arent that difficult.

But the point is, nobody has done it yet

If I can find the oil pan + exhaust at a junkyard/recycler, I might try it... but they usually wont sell cats, which makes it somewhat difficult.
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Old 08-03-2006, 11:51 PM   #8
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plus from what i remember the o2 sensors are in the headers not a catpipe, like its a two in one piece

so since theyd read different prob throw some form of a code

i just see a whole lotta work for something not worth it, yea you wanna look stock but who cares the 2.5i feels faster because of the avcs or wahtever not the cheap little header ha
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