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Old 07-01-2016, 09:49 PM   #1
dev6565
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Join Date: Jun 2015
Chapter/Region: South East
Location: Clarksville, TN
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2006 WRX Limited
Aspen White

Default Question about stock oil cooler on 06 WRX

So through some googling I have found that the 06 WRX seems to be one of the only model years to use a PN: 21311AA071 cooler while the 04-07 STI, 02-05 WRX, and 05-09 LGT use PN: 21311AA051. Whats up with the difference in just 1 or 2 model years and even between years of the same model car? Does anyone know if the 051 PN can be made to work with the 06 WRX? Reason being is that the 071 is about $100-150 more when it seems the cooler itself is nearly the same. From what I've read maybe the headers impact the fitment?

Just looking to see if anyone has run into this or not and can help me out. I'm collecting parts for an engine build and saving $100-150 is significant enough for me to look into it a little further.
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Old 07-02-2016, 07:52 PM   #2
mrsaturn7085
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06-07 got the EJ255 w/tilted oil cooler - I'm pretty sure it was to provide a minor amount of exhaust clearance. It has more components and more places to leak.

None of the OEM water-cooled oil coolers are worth spending money on... they should really call them oil pre-heaters.
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Old 07-03-2016, 12:06 PM   #3
JarHarms
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Join Date: Jan 2007
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Location: DeKalb-ish, IL
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06 WRX Ltd
02 Forester S

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It utilized a tilted mount to provide clearance to the exh manifold crossover pipe. The 2006-07 WRX used a crossover that was strait on one end and a different RHS manifold elbow than prior WRX and all STI models (USDM).
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Old 07-03-2016, 07:17 PM   #4
dev6565
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Aspen White

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Quote:
Originally Posted by JarHarms View Post
It utilized a tilted mount to provide clearance to the exh manifold crossover pipe. The 2006-07 WRX used a crossover that was strait on one end and a different RHS manifold elbow than prior WRX and all STI models (USDM).
Ok that makes sense. Good info, thank you. One more question, since the difference is to provide exhaust manifold clearance, would installing an aftermarket header, such as the Tomei UEL allow me to avoid this issue all together and install the STI cooler?
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Old 07-04-2016, 02:06 PM   #5
omgawg
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Quote:
Originally Posted by dev6565 View Post
Ok that makes sense. Good info, thank you. One more question, since the difference is to provide exhaust manifold clearance, would installing an aftermarket header, such as the Tomei UEL allow me to avoid this issue all together and install the STI cooler?
Thats correct
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Old 01-10-2017, 06:36 PM   #6
rallynutdon
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Chapter/Region: Tri-State
Location: Reading PA KB3UOQ
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1993 Impreza, WRX
drive train, Open class

Default 06 exhaust header

I have an 06 WRX motor I'm rebuilding. The pipe between the headers is somehow loose in the middle. I have a complete set from an 02 WRX and I don't see any difference between it and the 06 so I don't understand the statement in post #3 above. Anyone have any more insight. TIA.
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Old 01-11-2017, 02:46 PM   #7
JarHarms
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Join Date: Jan 2007
Chapter/Region: MWSOC
Location: DeKalb-ish, IL
Vehicle:
06 WRX Ltd
02 Forester S

Default Question about stock oil cooler on 06 WRX

Someone altered that engine. Unless it came out of "your" car that you've owned since new and have not changed those components.
Or the difference isn't noticed. Try bolting up those 02 parts. Then difference might be seen.

Last edited by JarHarms; 01-11-2017 at 05:52 PM.
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