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Old 10-16-2000, 01:46 PM   #1
Scooby Specialist
Member#: 2348
Join Date: Sep 2000
Chapter/Region: MWSOC
Location: St.Louis
2006 WRX TR
Steel Grey Metallic

Lightbulb 99 RS fuel/air questions

Ok all, what is the final rueling on installing an intake kit like ISR's or Rallispec's on a 99RS. Do I need a fuel pressure regulator, or an AFC like Apex's. I have heard some say, its no problem, while others say its an essential. I am leaning towards ISR's, because it keeps the second plenum. But I would like to add Rallispec's heat shield, or I'll make my own. I do race my car, on the track, and autocross it. So she's not driven sedately by any means. Any help, advice, etc will be appreciated.

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Old 10-16-2000, 03:55 PM   #2
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Join Date: Jun 2000
Chapter/Region: MWSOC
Location: Gretna, NE
1995 WRX
2002 Legacy


I'd like to know this too. However form what I've heard...
First you need to retain stock pedlum to keep that ever thrusting low end torque.
And unless you do this AFC is probablly needed. However Cobb Tuning is developing an intake that is designed for a MY99 and no need for a AFC or anything, it obviously retained the stock pedulm It is due out in June of 2000... yeah obviously that hasn't happened, but I think it is supposed to be out soon. I'm still keeping my fingers crossed although I'm starting to spend money else where 'cause I don't think it is coming.

my 2 cents we need some hard evidenc from some MY99 tuners out there.
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Old 10-16-2000, 05:57 PM   #3
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04 STi
like theres a choice BLUE


I think Cobb tuning's intake will replace the actual MAF sensor so there may be a 3 inch tube and a cone filter on it. I have made my own intake, keeping the air box near the fender. I bought some 90 degree rubber tube 3" and a 3" aluiminum pipe. And another straight 3" rubber piece. It works great, I haven't lost any low end at all because the intake is as long as the stock one, and I don't have the above 5500 rpm run lean condition, because of the use of the stock intake box. I have not blown my MAF yet, but I do get a little intake back fire every once in a while so I am a bit concerned about that. But I am waiting for the Cobb Tuning intake to come, so I can avoid messing with my computer. Thats my 2 cents
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Old 10-16-2000, 06:45 PM   #4
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Location: Seattle, WA, USA
2003 WRX
WR Blue Pearl


I would be interested in any information on this as well. Not interested in blowing my MAF for limited performance gains.
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Old 10-16-2000, 09:56 PM   #5
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Location: Portland Or . SPEC

I certanly hope that an AFC isn't required when you keep the stock air box. I made my own cold air intake out of PVC and used a K&N filter that fits in my fender. I haven't had any noticable problems. I have the MAF secured pretty solid, I hope that's all I need to do. I am curently looking for a place that will sell alluminum tubing at an affordable price.By the way, does anybody know where I can go? But word of this COBB intake is getting me all excited. It would be cool to not have to worry about a MAF addaptor ar anything, and having all one size diamiter. Probably alot less restricting.
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Old 10-17-2000, 07:27 AM   #6
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2006 WRX TR
Steel Grey Metallic


I'm looking into the ISR kit, which keeps the second intake plenum, which is just upstream from the thrttle body. Basically it just replaces the fender airbox and tubing. So in theory, I shouldn't loose any low end, I should gain top end and much more noise (which is good). I asked the same question to COBB and RALLISPEC and am awiating replies. As soon as I get them, I will post them here.
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