Subaru Legacy Forums

Subaru Legacy Forums (
-   Intake and Exhaust (
-   -   Intake Manifold (

scoobiedoo05 05-22-2012 11:31 AM

Intake Manifold
Hey guys and gals,

My 05 gt has a leak that i have been trying to fix for a while now, so i brought it into the shop and they came back telling me that my lower intake manifold was leaking bad.

I am not familiar with what this looks like or where to find a replacement parts for it. I asked if it was the TGV's but they said it was lower then that. That part just confused me so any information about that would be helpful.

Also i was wondering if there was any alternative to our plastic intake manifolds (like the STI's manifold)?

Thank you for any info.

OutbackXT05 05-22-2012 12:18 PM

The sti manifold and the cosworth manifold are both alternatives to out oem ones but you cannot use the oem top mount. The location of the throttle body is different.

scoobiedoo05 05-22-2012 12:29 PM

Alright thank you for the information! I am not worried about the intercooler situation because i have a FMIC, just have to figure out how to change the piping so it could fit that.

DocHolladay23 05-22-2012 12:34 PM

I've always been a fan of the plastic IM on the LGT, doesn't get as hot or hold the heat like the STI one. If it was me I would just get another OEM LGT manifold.

scoobiedoo05 05-22-2012 12:44 PM

Good point doc. The only thing im thinking as a downside to ours is that they can crack easier

paintpollz 05-22-2012 12:45 PM


Originally Posted by scoobiedoo05 (Post 3906991)
Good point doc. The only thing im thinking as a downside to ours is that they can crack easier

they don't crack

bmx045 05-22-2012 12:50 PM

lolol. our manifolds dont crack, and if your's did then you did something seriously wrong.

lower manifold are the tgv's, which are a separate part all together from the intake manifold.

there's a gasket between the head and the tgv's(probably where the leak is, there's no lower manifold than this, unless they're trying to tell you the head is leaking, lol), and the tgv's to intake manifold

scoobiedoo05 05-22-2012 05:36 PM

ya i kinda figured they were the tgvs.
the shop i brought it too by my house seems a little sketchy and didnt seem they knew what they were talking about since they wanted 1300 to fix it, and they were the ones who told me that our manifolds were notorious for cracking

bmx045 05-22-2012 05:45 PM

Probably because he noticed it was "plastic" and figured it was weak. Infact its a dense composite that is difficult to crack, and the design of the manifold gaskets being rubber and tall in structure prevents warping of the manifold from overtorquing on a flat surface(like the tgv to head gasket). The temperature fluctuations can change the characteristics of the composite so it needs a cushiony gasket for expansion and contraction. (much why the torque specs on maniold 10mm bolts are only 6ftlbs)

Max Capacity 05-23-2012 08:28 AM

You have a 05, there are a few things you'll want to do while the intake manifold is lifted off the engine.

Replace the orange o-rings at Intake to TGV's.
Tighten the 6 hose clamps on the gas lines.
Rotate the one clamp so you can tighten from the top, if ever needed.
Have screw type hose clamps ready, to replace the oem style that need special tool.

See my thread for some pictures.

MDKSDMF 05-25-2012 02:40 PM

id get a black OEM piece and have it painted red to look like the sti..or any other "custom color"

All times are GMT -6. The time now is 07:35 AM.

vBulletin Optimisation provided by vB Optimise v2.6.3 (Lite) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.