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Old 10-16-2008, 11:22 AM   #1
Ferraz
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Default STI and WRX intake manifold difference?

OK. I’m sure it has being covered before, but I could not find it! So any help would be nice.

Is the STI intake manifold better or is just “cosmetics”? If it is, will a 06 + STI manifold fit/work with my 06 WRX? Any advantages?

Thanks
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Old 10-16-2008, 11:37 AM   #2
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should fit no prob both dbw set ups
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Old 10-16-2008, 11:40 AM   #3
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I believe they are the same minus the red.
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Old 10-16-2008, 12:53 PM   #4
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It will net 0HP and 0TQ at the expensive of one pain in the ass install...doing that swap is a mother let me tell you.
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Old 10-16-2008, 01:04 PM   #5
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when did the wrx goto the plastic manifold? 08? Cause I'm thinking there could be benefits of getting rid of it.

Plastic FTL
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Old 10-16-2008, 01:22 PM   #6
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Quote:
Originally Posted by Unabomber View Post
It will net 0HP and 0TQ at the expensive of one pain in the ass install...doing that swap is a mother let me tell you.
OK, Thanks! I think I will use the time and money in other mods.


Quote:
Originally Posted by onesixnin View Post
when did the wrx goto the plastic manifold? 08? Cause I'm thinking there could be benefits of getting rid of it.

Plastic FTL
Yes, 2008.
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Old 10-16-2008, 02:08 PM   #7
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Quote:
Originally Posted by onesixnin View Post
when did the wrx goto the plastic manifold? 08? Cause I'm thinking there could be benefits of getting rid of it.

Plastic FTL
I'm 99% sure that the previous metal manifold will NOT work on an 08
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Old 10-16-2008, 02:23 PM   #8
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Quote:
Originally Posted by Unabomber View Post
It will net 0HP and 0TQ at the expensive of one pain in the ass install...doing that swap is a mother let me tell you.

Yea, I was doin a turbo inlet and some1 told us to take off the intake manifold. Total fail.
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Old 10-16-2008, 06:02 PM   #9
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Yea from what I read the red is just some heat resistor thing, but it doesn't really net anything at all. If you want the red take yours off and just paint it.
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Old 10-16-2008, 11:51 PM   #10
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I believe there a few small little nik nak differences but nothing that causes power gains/losses. And the 08 manifolds aren't plastic (which I'm sure you know or figured, anyway). I've heard that material is actually better for retaining heat than the metal. Just what I've been told, though...
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Old 10-17-2008, 01:07 AM   #11
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Stick with the stock manifold. The plastic manifold is lighter and works just as well.
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Old 10-17-2008, 01:09 AM   #12
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Quote:
Originally Posted by THR3E11EVEN View Post
I believe there a few small little nik nak differences but nothing that causes power gains/losses. And the 08 manifolds aren't plastic (which I'm sure you know or figured, anyway). I've heard that material is actually better for retaining heat than the metal. Just what I've been told, though...

Not plastic, but something that looks like plastic...




I heard that is not just about heat. It is easy/cheap to make a very smooth surface with "plastic".

Regards
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Old 10-17-2008, 01:14 AM   #13
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The red paint on the STI intake manifold is just that - paint. No thermal characteristics.

The 08s do have a plastic [or plastic-esque] IM. The STis don't, but the WRXs do. Benefits are decreased heat transmission [it's like a big phenolic spacer... kinda...ish], drawbacks are decreased holding pressure.
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Old 04-02-2009, 01:11 AM   #14
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do you know how much pressure it can handle? (the 08 plastic)
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Old 04-02-2009, 06:26 AM   #15
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Quote:
Originally Posted by onesixnin View Post
when did the wrx go to the plastic manifold? 08? Cause I'm thinking there could be benefits of getting rid of it.

Plastic FTL
Yes it was in 08. No there are no benefits to changing it unless you are making some really insane power and it wont work with your set up.

Quote:
Originally Posted by 06WHTWRX View Post
I'm 99% sure that the previous metal manifold will NOT work on an 08
Yes it will work but its a total PITA! You will need parts from the 08+ STI and an older 07- WRX as well to complete the swap. Power gained would be about 0hp on a stock or even well moded car.

Quote:
Originally Posted by dexterous View Post
Stick with the stock manifold. The plastic manifold is lighter and works just as well.
This^!!!

Quote:
Originally Posted by nmasse View Post
do you know how much pressure it can handle? (the 08 plastic)
I saw some one on another forum take one and block it off and it held 35PSI over night with no problems! FYI thats more abuse in 12 hours then a 35R would put on it in a year!

The new Composite Intake manifold has nothing wrong with it! The only real problem is the new I/C. It has composite end tanks and at higher boost levels they are known to start leaking at the joint to the core.

As for the OPs question its red paint! thats it. Nothing more.
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Old 04-02-2009, 07:12 PM   #16
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just stick with the plastic manifold. I have yet to read where one failed under pressure and like already said it saves weight and is smoother on the inside.
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Old 09-21-2009, 09:25 AM   #17
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What about swapping the 08 wrx intake manifold with the 09 wrx?
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Old 09-21-2009, 10:06 AM   #18
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Quote:
Originally Posted by _MFB_ View Post
What about swapping the 08 wrx intake manifold with the 09 wrx?
They are the same.

I think there was an LGT running more than 30psi on the composite IM.
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Old 09-21-2009, 04:19 PM   #19
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Compromise?

But for the OP if you're planning on deleting your TGVs any time soon just paint it then.
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Old 09-22-2009, 07:58 PM   #20
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Can anyone else hear a plastic whistle sound around 4k rpms on their 09 WRX? Kinda sounds like a train whistle. I just figure its the intake manifold.
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Old 09-22-2009, 08:08 PM   #21
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Running a STi manifold on an 06 wrx here. I had GS port it but they had no wrx cores. Only difference was the FPR vac line tap, needed a longer hose, no big deal.
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Old 09-22-2009, 11:20 PM   #22
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Quote:
Originally Posted by Unabomber View Post
It will net 0HP and 0TQ at the expensive of one pain in the ass install...doing that swap is a mother let me tell you.
my knuckles agree with DISSSSSSSSSSSSSSSSs
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Old 09-23-2009, 12:21 AM   #23
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FWIW the LGT uses the same manifold. I bought a STi off ebay soley for the wrinkle red color and wanting WRX throttle body placement for intercooler routing.

Hill up at Agile performance told me this was actually a good mod to do, because the LGT/08+wrx manifold suffers from "alot of turbulence" in the air stream. I didnt ask any other questions about it, but he knows what he is doing enough for me to believe him. :shrug: I dont think (nor got the impression that he does) it is a life-altering, dyno-smashing modification, but is not without merit, and may be worth considering for the 08+ crowd doing TGV's anyway....its not expensive, and you are "in the neighborhood" so to speak. Just be aware whatever IC setup you were running previously, some or all of it wont work afterwords.
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Old 09-23-2009, 09:13 AM   #24
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Hmmm, if anything the composite manifold is likely to reduce turbulent flow since it is so smooth inside relative to a cast aluminum manifold.
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Old 09-23-2009, 09:34 AM   #25
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i think it has more to do with the way the throttle body was aligned/placed than the interior surface. Ive also never looked inside one of the composite manifolds. There could be parts where the molding left protruding edges at the runners or tb or wherever. The composite manifold is much cheaper to produce than the sti one is, and lets face it, subaru wasnt out looking to do the modding community favors by making the change, it was purely a cost decision. If it functioned better for less money, one has to ask the question why the STI's wasnt changed in 2008 like the wrx was. I would imagine subaru left the metallic one on the sti for a reason.

Last edited by Leggy_09; 09-23-2009 at 09:40 AM.
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