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Old 06-15-2004, 11:21 AM   #1
Scooby Specialist
Member#: 40413
Join Date: Jul 2003
2001 BRP RS-T EJ257
Link'd - 252WHP 274WTQ

Default Injectors in a 2001 RST

Ok, I've done the reading, and the searches, and everything points to aftermrket injectors (RC, Bosch)...

My question is... isn't the intake manifold of the 2001 RS pretty much the same as the 2004 STI????.... If it is.... and I think it is, why is it that STI injectors don't fit?

Just trying to see if anybody has actually TRIED installing STI injectors on an 00-01 RS intake manifold.
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Old 06-16-2004, 12:35 AM   #2
Scooby Newbie
Member#: 18129
Join Date: Apr 2002
Location: Zanesville, Ohio
1999 2.5RS-T Impreza
Silverthorn metalic


I have a 99 RS-T and i'm currently having the same problem! I bought STi injectors (because i was told they will fit) and when i went to install them into my Vishnu fuel rails, they don't seem to fit "snug" in the rails, as if the rubber around the top of the injectors were too small, but they do seem to fit fine in the engine itself.

I told a local shop about my problem and they said i need a wrx intake manifold because i guess my fuel rails that i got from Vishnu are for a WRX even though i ordered 2.5RS ones, but i cut the spacers down to make them fit....i really don't see how this will fix my problem because the injectors arn't fitting into the fuel rails themselves.

Does anyone know what injectors will fit in my Vishnu fuel rails? or any fuel rails that WILL work for my 2.5RS? I need more fuel badly!!! Please help!!! Thanks!!!
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Old 06-16-2004, 02:49 AM   #3
Scooby Specialist
Member#: 1277
Join Date: Apr 2000
Chapter/Region: NWIC
Location: issaquah, WA
1999 Minnam Stage 2
Cobb Stage3 engine, TEC3


i use Vishnu fuel rails with 600cc RC injector it work find
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Old 06-16-2004, 07:34 AM   #4
Scooby Specialist
Member#: 2604
Join Date: Oct 2000
Chapter/Region: NESIC
Location: CA
1999 2.5RSt


you know how people mod their WRX injectors so they flow ~740cc?

if you read the larger thread on this modification of WRX blues you will find that several people have succeeded at modding RS style injectors to about the same flowrate. It is much more involved and requires basically better dremeling skills or a machine shop to get it done right.

The problem is that there a a restrictor cap over all subaru injectors that has a bunch of tiny holes in it. It is these holes that determine the spray pattern of the injector as well as the flowrate. In the thread they talk about the fact that STI pink injectors and WRX isnjectors are IDENTICAL on the inside! Someone split them both. The oly difference is in the size of the holes in the restrictor plate on the tip, and obviously the paint color of the housing.

so the thing is WRX injectors have end caps welded up on the side of the injector beyond the very tip, so that if you simply cut around the injector with a dremel the end cap will just fall off. RS injectors have a sort of a spot welded rng around the injection port. You CAN dremel out this weld and get the restrictor plate to fall off BUT you have to get much much closer to the center injection port that with WRX injectors. It CAN be done.

look here if you are brave!


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