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Old 06-22-2001, 12:47 PM   #1
Scooby Specialist
Member#: 4782
Join Date: Mar 2001
Chapter/Region: SCIC
Location: I'm not fast, you're just slow
well SF9, AE92
SF9-Brack and AE92-faded

Question What year NA 2.5 is best to turbo?

Hello everyone,
I am gathering info on what MY 2.5RS 5spd. is the best to turbocharge. I will be purchasing one when my lease is up and the Forester is paid off. So in the meanwhile, if any of you can help me out I'd greatly appreciate it. I want driveability,but still don't mind roosting some unsuspecting teen once in a while. TIA
~ferretboy signing out
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Old 06-22-2001, 03:21 PM   #2
MY99 2.5GT
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Join Date: Mar 2001
Chapter/Region: MAIC
Location: Martinsburg, WV, USA
1999 Legacy 2.5GT
12 Legacy GT 13 Armada


I think the best possible base motor for a turbo would have to be around the 99 ish area. The important part is find a motor that has a phase-II block with phase-I DOHC heads. I have this on my Legacy and even from stock with no mods I could feel that I have a little more high rpm power and faster throttle response.
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Old 06-22-2001, 03:59 PM   #3
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Location: Wheaton, MD

For some reason I think those hybrids were only in Legacies. Could be wrong. In which case an RS w/a Phase II Block and single cam heads would be good. Whatever the case, its the Phase II block you want.
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Old 06-22-2001, 04:01 PM   #4
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Location: Calgary, Alberta, Canada
'99 BGP Legacy GT
'98 QS Legacy L (auto)


MY99 2.5GT - You are partially correct
1) yes the Legacy GT's in 1999 came with DOHC and phase 2 block, but only some, the rest used the phase 1 block.

2) You want to find a '98RS that is as close to that last build date possible, reason why is b/c that's when they had the DOHC + phase 2 block. If you get a '99RS, it will have a phase 2 engine with the phase 2 SOHC heads.
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Old 06-22-2001, 06:33 PM   #5
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Location: Billings, MT
1998 Impreza RS
Rally Blue


How do you tell the difference between a phase I and a phase II block?
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