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Old 08-04-2010, 10:00 PM   #1
Scooby Newbie
Member#: 204281
Join Date: Feb 2009
Chapter/Region: NWIC
Location: estacada, oregon
2005 wrx

Subaru Stars what would happen if you put a sti intake manifold on n/a 2.5l?

i was woundering if there would be an plus in putting on a sti or wrx intake manifold on a n/a 2.5l over using the stock one?
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Old 08-04-2010, 10:23 PM   #2
Back Road Runner
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


You'll lose power. Actually I'm not entirely sure. Chances are you will lose some power though.

Look at two specific things. The intake manifold and exhaust manifold are tools for controling the torque band of the engine, along with the cams and heads. It's all about air flow and optimizing that flow. The two things you look at are the intake manifold runner diameter and the intake manifold runner length. The diameter defines where the optimum scavenging occurs and subsequently maximum torque. The length has to do with pressure wave tuning, sort of like a musical instrument. The length is tuned to a specific frequency and helps optimize power around wherever that length correlates to engine rpm. Realize that the flow should be optimized the same way through the whole engine. This means the intake manifold design matches cam setup, head porting, and exhaust manifold. It's just not the intake manifold alone. You still need to address the rest of the car. You also need to understand if the STI intake manifold is even suitable for the NA engine in the first place. The design may work great on a turbo motor, but you may find that the design is completely inappropriate for any near stock NA engine.
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Old 08-10-2010, 07:10 PM   #3
Scooby Newbie
Member#: 243917
Join Date: Apr 2010
Chapter/Region: SCIC
Location: Northridge, Ca
2000 Impreza 2.5RS
Sedona Red Pearl


kaboom. JK.

I'd imagine it wouldn't be beneficial in any way...
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Old 08-11-2010, 08:44 AM   #4
Scooby Specialist
Member#: 201277
Join Date: Jan 2009
Chapter/Region: MAIC
Location: Arlington VA
2008 08 QSM 5MT LGT


The STi and your 2.5i are both cast aluminum manifolds. This must be a asthetic oriented question so my answer would be take yours off and paint it red
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Old 08-11-2010, 09:00 AM   #5
Scooby Specialist
Member#: 38222
Join Date: Jun 2003
Chapter/Region: Tri-State
Location: Cicero, NY
'10 &'12 Foresters
another Miata convert


VHT red wrinkle in spraybomb form works nicely!
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