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Old 04-06-2005, 01:47 PM   #1
DrBoy01
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Default Who has swapped in a plastic intake manifold?

After doing several searches and reading around, I saw that several people had put a plastic intake manifold from the 04 2.5 RS on their older RS. However, I didn't see any information on performance, install, part numbers, or pricing.

A couple of questions:

1) Who has done this? [I know that zzyxz (spelling?) has one]

2) How much did it cost, and what was the part #?

3) Are there any gains to be made?

4) Is the part a direct replacement, or are some modifications required for the install?
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Old 04-06-2005, 03:16 PM   #2
Aphex28
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I still want to see a picture of these manifolds!
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Old 04-06-2005, 03:53 PM   #3
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I am very curious about this as well.
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Old 04-06-2005, 04:23 PM   #4
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I'll take a pic and post it
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Old 04-06-2005, 06:25 PM   #5
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Here are some pics I promised. I realized that I really need to clean the engine bay a little






A thing to note here for those that don't know why a plastic manifold was used. In the late model Camaro with the LS1 engine in them, they had a composite plastic manifold in them. Why? They were less in weight, smoother and flowed better than metal, and were just as strong. Horsepower TV just recently did a tear down of the LS1 out of a Camaro and they talked about the composite intake manifold. I don't know if the Corvette during the period shared a plastic manifold as well or not. Unfortunetly it is still the spider style (long runners), but I am glad that Subaru stole at least one good thing from GM in their partnership. Price and part number I have no idea to the orgininal poster.
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Old 04-06-2005, 06:34 PM   #6
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It should also help keep intake air temps down no?
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Old 04-06-2005, 06:35 PM   #7
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yep it keeps the intake charge down because it doesn't conduct heat as well as metal

ps- the more I look at the more I think "**** I need to really clean my engine bay"
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Old 04-06-2005, 07:39 PM   #8
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I like the looks, but the question still remains: How much does it cost, is it a direct replacement, and does it provide any power gains?
I understand that the PCV valve plugs into a different spot on the '04; I guess it can't be that much of a direct replacement then.
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Old 04-06-2005, 09:15 PM   #9
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It also provides a couple additional points for an electrical grounding kit: the coil pack and the throttle body. They are now isolated from standard engine block grounds. The coil pack comes stock with a little one (you can see it under the bolt in the pic), but the throttle body has nothing. The individual sensors on the TB have their own grounds, but a static charge builds up from air going through the TB and there is no place for it to go (unless you provide one).
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Old 04-06-2005, 11:21 PM   #10
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I understand that the plastic intake manifold was a good idea for subaru to use in their vehicles, but why did they go back to cast aluminum for the 05? They only used it for one year???
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Old 04-06-2005, 11:36 PM   #11
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The above poster poses another good question.

Finally, why has there been no aftermarket support for a composite intake manifold? You'd think us RS guys would be all over that like a fat kid on cake.
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Old 04-07-2005, 12:09 AM   #12
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I seem to recall zzyzx saying it had a price around $249....so not unreachable for the benefits it has. I dunno why SOA went back to aluminum for it's manifolds.....I would think it would be cheaper to make than metal.

As for aftermarket composite manifolds......the molds alone are going to be tens of thousands in tooling before the first one is even tested.....That may be one reason we haven't seen anyone offering them.


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Old 04-07-2005, 02:42 AM   #13
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It can't possibly cost any more than aluminum manifolds.
Plus, its not like Subaru only makes a couple cars a year...
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Old 04-07-2005, 02:58 AM   #14
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i would like to see a review done from someone that has purchased one of theses manufolds and see what they think. so is anyone who has one willing to do this? thanks
chris
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Old 04-07-2005, 03:57 AM   #15
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Quote:
Originally Posted by powerlabs
It can't possibly cost any more than aluminum manifolds.
Plus, its not like Subaru only makes a couple cars a year...
I dunno if this is directed at my post.....but I was referring to AFTERMARKET composite manifolds and why there might not be a slew of them on the market.
Quote:
Originally Posted by allsubaru83
i would like to see a review done from someone that has purchased one of theses manufolds and see what they think. so is anyone who has one willing to do this? thanks
I believe the review has been done a looong time ago. I remember talking to Steve (zzyzx) about this shortly after he put it on his car....that was 2 yrs ago. Along with recent comments in other threads regarding how well they work and what a good deal it is. He's got a PN for it.....and has posted it as well.

If it fit the DOHC heads....we'd have a couple for our cars too.
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Old 04-07-2005, 11:37 AM   #16
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are there any instalation instructions out there for this? and if so is there any links to these? i'm considering this for my car....
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Old 04-07-2005, 04:56 PM   #17
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Quote:
Originally Posted by outbckspt96
are there any instalation instructions out there for this? and if so is there any links to these? i'm considering this for my car....
Quote:
Originally Posted by Storm
If it fit the DOHC heads....we'd have a couple for our cars too.
If you have DOHC heads....you're SOL.


Jay Storm

Last edited by Storm; 04-08-2005 at 12:36 AM.
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Old 04-07-2005, 08:52 PM   #18
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I must say the aluminum intake manifolds do get hot easily.
I can leave my hand on the plastic intake manifold after laps around the track. and my hand would like get a little warm... It's amazing how the temperatures varies from both manifolds yet only produce the same amount of HP.
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Old 04-08-2005, 09:14 AM   #19
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'04 2.5 RS intake manifold: 14001AB540
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Old 04-08-2005, 09:29 AM   #20
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Quote:
Originally Posted by Storm
I dunno if this is directed at my post.....but I was referring to AFTERMARKET composite manifolds and why there might not be a slew of them on the market.
I believe the review has been done a looong time ago. I remember talking to Steve (zzyzx) about this shortly after he put it on his car....that was 2 yrs ago. Along with recent comments in other threads regarding how well they work and what a good deal it is. He's got a PN for it.....and has posted it as well.

If it fit the DOHC heads....we'd have a couple for our cars too.
Jay Storm
The molds for injection plastic molding are much more expensive than those for sand cast aluminum. So it would be very hard for an aftermarket company to make their investment back with such a limited demand for the product that the Subaru market represents. It much easier to tool up for bending and welding some stainless pipes together and make exhaust systems.
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Old 04-08-2005, 06:20 PM   #21
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Quote:
Originally Posted by Powerlabs
It can't possibly cost any more than aluminum manifolds.
Plus, its not like Subaru only makes a couple cars a year...
Quote:
Originally Posted by GuyLR
The molds for injection plastic molding are much more expensive than those for sand cast aluminum. So it would be very hard for an aftermarket company to make their investment back with such a limited demand for the product that the Subaru market represents. It much easier to tool up for bending and welding some stainless pipes together and make exhaust systems.
Fixed it for you......


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