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Old 04-08-2012, 09:41 PM   #1
ruggerheist
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Question swapping intake manifolds

I have a 2008 legacy gt. It currently has a "plastic" oem manifold. im looking into a BW EFR 7670 twinscroll and would have to rotate the manifold. At this point ive heard mixed opinions on my current manifold some say its great for preventing heat sink while others say its weak and doesnt allow proper air flow at higher power. so my question is what would be a good option in regards to swapping out my manifold for another? what year and vehicle would fit?
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Old 04-09-2012, 12:39 PM   #2
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Bump for some advice
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Old 04-09-2012, 12:44 PM   #3
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Try http://www.legacygt.com/ they might have more answers.
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Old 04-09-2012, 11:19 PM   #4
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I'm on there. That's where I got all my differing opinions but thanks
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Old 04-09-2012, 11:21 PM   #5
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you don't have to rotate the manifold. why would you think so? there's even a couple build threads of folks with 08+ wrx and 05+ lgt doing what you are planning. i've got a 08 and a 7670 going on next week and while i am doing a rotated jdm long runner, i know for a fact it wasn't required.

perhaps you are committed to running full-race's fmic setup and tubing which requires a reverse mount? you couldn't do that with the composite manifold.
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Old 04-11-2012, 11:14 AM   #6
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You just reposted my op. What manifold from what model/year will fit an ej255?
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Old 04-11-2012, 01:06 PM   #7
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Quote:
Originally Posted by ruggerheist View Post
You just reposted my op. What manifold from what model/year will fit an ej255?


you're whole premise/query/search is based on the fact that you state you have to rotate your manifold for your future plans - you do not. your stock manifold will work just fine.
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Old 04-11-2012, 03:01 PM   #8
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Full race kit requires a rotated manifold, so yes I am committed to that. So since I can't reuse my manifold what can I use? Would an RS work?
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Old 04-11-2012, 09:06 PM   #9
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any to provide further specificity to this thread, you are talking about how the full-race fmic kit requires the rotated manifold. you are not under the presumption that the full-race twin scroll kit does, correct?

also, are you familiar with the costs and laborious effort is required in rotating a manifold (regardless of which), custom efforts, possible throttle body issues/resolution, etc required? if not, it is far more cost effective to run your stocker manifold in stock configuration with any myriad of cores and just have the one charged pipe fabbed up.

if you're still set on the full-race fmic kit and reversed manifold, just about any manifold can work. you will want to take into consideration the throttle body of the manifold you are using and that of your current car. all stis are DBW as are all 06+ wrx. the 02-05wrx is DBC.

if you really don't care about costs, then it'd be a great consideration to perhaps pick up a jdm long-runner manifold and eliminate the necessary work and costs of tgv deletes. this will of course require work to swap from dbc to dbw and a bit of fab with the fuel rail alignment and holding bracket.
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Old 04-12-2012, 01:45 AM   #10
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Out of all if your posts, you would've saved yourself and myself by just posting the very last paragraph. But ill take care of tgv deletes separately so long runner or whatever is not happening. How about this; What make/year subaru has an intake mani that is capable of directly swapping over onto an 08 legacy gt?
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Old 04-12-2012, 01:53 AM   #11
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just a little bit more effort and specificty in your original post would have saved us some time. and you have yet to confirm details of the build and components.

i guess you really don't want sage advice. you just want the answer to a question that very likely will lead you down the wrong path and higher costs with no appreciable benefit.

ok, fine.
Quote:
Originally Posted by ruggerheist View Post
Out of all if your posts, you would've saved yourself and myself by just posting the very last paragraph. But ill take care of tgv deletes separately so long runner or whatever is not happening. How about this; What make/year subaru has an intake mani that is capable of directly swapping over onto an 08 legacy gt?
an 08+ wrx. it's the same manifold so it will swap right over. outside of that, no other manifold is capable of directly swapping over.

this is an unnecessarily tedious effort and my exit. sincerely, good luck to you, sir.
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Old 04-12-2012, 10:40 AM   #12
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The specifics are still being ironed out, I.e. fueling, how tgv deletes are being handled, etc. I do appreciate your advice, just saying you could've been more concise. And I could've given more info
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Old 04-13-2012, 04:06 AM   #13
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If I go rotated I'll just flip the stock manifold. They are plenty strong, and I strongly suspect they're easier to flip than the old style manifolds since the TB doesn't angle upward. Set up the FMIC so the charge flows clockwise. Find some pics of a flipped LGT manifold and you'll see what I mean - it works out pretty well.
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Old 04-14-2012, 01:23 PM   #14
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Quote:
Originally Posted by monkiboy
any to provide further specificity to this thread, you are talking about how the full-race fmic kit requires the rotated manifold. you are not under the presumption that the full-race twin scroll kit does, correct?

also, are you familiar with the costs and laborious effort is required in rotating a manifold (regardless of which), custom efforts, possible throttle body issues/resolution, etc required? if not, it is far more cost effective to run your stocker manifold in stock configuration with any myriad of cores and just have the one charged pipe fabbed up.

if you're still set on the full-race fmic kit and reversed manifold, just about any manifold can work. you will want to take into consideration the throttle body of the manifold you are using and that of your current car. all stis are DBW as are all 06+ wrx. the 02-05wrx is DBC.

if you really don't care about costs, then it'd be a great consideration to perhaps pick up a jdm long-runner manifold and eliminate the necessary work and costs of tgv deletes. this will of course require work to swap from dbc to dbw and a bit of fab with the fuel rail alignment and holding bracket.
I'm looking to go with the jdm manifold with the long runners and need to know everything needed for the swap.I already have aftermarket topfeed fuel rails and topfeed id1000 Injectors.I just started a thread on this matter so any feedback will be highly apriciated
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Old 04-14-2012, 02:31 PM   #15
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Quote:
Originally Posted by sleazy07sti View Post
I'm looking to go with the jdm manifold with the long runners and need to know everything needed for the swap.I already have aftermarket topfeed fuel rails and topfeed id1000 Injectors.I just started a thread on this matter so any feedback will be highly apriciated
as to avoid a threadjack since your query is very different, ill reply in your thread.
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Old 04-14-2012, 03:04 PM   #16
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Quote:
Originally Posted by monkiboy
as to avoid a threadjack since your query is very different, ill reply in your thread.
Yea didn't mean to thread jack.definitely apriciate it bro
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Old 04-15-2012, 12:30 PM   #17
ruggerheist
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I let my ignorance get in the way of this thread. Looked into a long runner and it makes sense. Monki guy, you mentioned the labor and cost involved with switching from dbc to dbw. My LGT is dbw so the long runner should, in theory, bolt right up?
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Old 04-15-2012, 02:07 PM   #18
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Quote:
Originally Posted by ruggerheist View Post
I let my ignorance get in the way of this thread. Looked into a long runner and it makes sense. Monki guy, you mentioned the labor and cost involved with switching from dbc to dbw. My LGT is dbw so the long runner should, in theory, bolt right up?
your lgt is DBW, correct. the jdm long-runner intake manifold is designed for a DBC throttle body. the intake manifold will bolt up fine in whatever configuration but you will need to either run the jdm rails or get a bracket fabbed up for the alternate jdm spacing of the fuel rail attachment of the manifold. then you have to find a way to get your DBW throttle body adapted to fit the DBC opening and bolt holes of the jdm intake manifold. there are a few ways to do this and it's really up to you.

these are the questions "sleazy*" has, though, in his thread if you want to read over there and perhaps even more ideas or folks with experience will contribute.

g'luck!
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Old 04-15-2012, 05:52 PM   #19
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Get an usdm sti intake manifold and be done with it.

Any year will work but different years have different connections.
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Old 04-15-2012, 06:23 PM   #20
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keep the stock manifold and be done with it.

they work well rotated too.
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Old 04-15-2012, 06:46 PM   #21
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Quote:
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keep the stock manifold and be done with it.

they work well rotated too.
Yes they do but not with the full race reverse intake fmic kit without modification.
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Old 04-15-2012, 08:51 PM   #22
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Quote:
Originally Posted by jamal
keep the stock manifold and be done with it.

they work well rotated too.
So the composite mani is strong enough to hold high boost pressure? That was my main concern, structural integrity.
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Old 04-15-2012, 08:52 PM   #23
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Quote:
Originally Posted by kellygnsd

Yes they do but not with the full race reverse intake fmic kit without modification.
What kind and how extensive of modification?
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Old 06-30-2012, 02:11 AM   #24
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bump from the dead...i officially have adapters for sale in order to run the dbw tb on the jdm long runner intake manifold.shoot me a pm for prices
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