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Old 09-11-2005, 08:21 AM   #1
Scooby Newbie
Member#: 95718
Join Date: Sep 2005
Default New CAI and Exhaust

Dear ALL

I am new to this thread so take it easy on me i just bought my New Impreza 1.6TS yes it is 1600 CC with a very slow 0-60 in 12.8 and 95 HP
so i want to change the airflow and install a Cold Air Intake and install a full Decat Exhaust. but i heard that if i did that it might change the air/Fuel Ratio and that can damage the engine. so will i have to make an ECU remap? my problem is i live in Egypt and there is no one in here who can remap the ECU i would even be lucky if i could have a good CAI and Exhaust that works fine. so if i will have to remap the ECU i am thinking of not tuning my car ?
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Hossamk is offline   Reply With Quote
Old 09-11-2005, 11:54 AM   #2
Scooby Specialist
Member#: 20998
Join Date: Jul 2002
Location: All Bunny, NY

Hey, welcome to the boards. That being said, If I were you, I would start emailing Subaru / Subaru aftermarket websites to see what they have that may be able to accomodate you. Can you post pics of your car? I would be interested in seeing it.
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Old 09-11-2005, 01:45 PM   #3
Scooby Specialist
Member#: 92913
Join Date: Aug 2005
Chapter/Region: W. Canada
Location: Winnipeg, MB
2005 2.5RS Wagon
Crystal Grey Metallic


This might sound like a guy from florida asking me how big my igloo is, but do you have the opportunity over there to beat that subie out in the desert a little bit?

As for your question, I'm sure doing just intake and a decatted exhaust won't hurt you as long as your fuel system is in good shape. Tuning always makes more gains than just bolting on and leaving it, but that might be a lot of money for very little gains. Also, if you're even a little mechanically inclined, there's an intake on Ebay I believe for a 1.8L Subaru, and you could probably make any minor changes that might be necessary, if any, yourself. For exhaust, custom is usually cheaper anyways, no need to spend big money on a package deal which you'll probably have to modify anyways.

Hope that helps.
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Old 09-11-2005, 03:49 PM   #4
Scooby Guru
Member#: 1134
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Dillsburg, PA
2007 BMW 328xi wagon


I agree to the custom exhaust. Most shops build mild steel catbacks for the Impreza, in 2.25" or so, for $150-250. Stainless is more of course, but honestly the car likely wouldn't last that long...

I'd definitely stick with 2.25" as the ideal diameter.

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Old 09-11-2005, 04:24 PM   #5
Scooby Newbie
Member#: 61888
Join Date: May 2004
Chapter/Region: SCIC
Location: San Gabriel, CA
2003 Outback Sport
Midnight Black Pearl


Lets get some pics of the car (underhood and under car would be helpful)!

i highly doubt 2.25" exhaust will be ideal for you... since you're down nearly a liter in displacement.

if your ECU is at all similar to the usdm impreza ECU you should be able to do cat-back (remove 2nd cat if it's present) and intake and not be too lean (the ECU does a pretty good job of taking care of things).

is the car MAF or MAP? if it's MAP, i can tell you pretty much any 3" or below intake is fine on our USDM cars (seems like 2.5 - 2.75" is ideal - several here have tested different intake diameters and effect on A/F).

Same as the exhaust, i'm thinking since you have less displacement, smaller intake tubes should be used. (ON a MAP car, larger the intake, the leaner the A/F - you can almost change the intake diameter as a form on manual tuning)

And, welcome! I was born in Cairo, Egypt! I'll ask my dad if he's ever heard of performance car shops in Egypt (i haven't).
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Old 09-11-2005, 04:29 PM   #6
Scooby Newbie
Member#: 89505
Join Date: Jun 2005
Location: Brasher Falls, NY
1998 Impreza 2.5 RS
Black Diamond Pearl


hey do any of you know about how many miles between oil changes with pretty spirited driving(high revs every once in a while) in an NA 2.5? i am running part synthetic 5-30. thanks...
98subyrezaRS is offline   Reply With Quote
Old 09-11-2005, 04:49 PM   #7
*** Banned ***
Member#: 82259
Join Date: Mar 2005
Chapter/Region: BAIC
Location: koledge at csus
1999 impreza 2.2L
Brilliant Red <4EAT Club>


Originally Posted by 98subyrezaRS
hey do any of you know about how many miles between oil changes with pretty spirited driving(high revs every once in a while) in an NA 2.5? i am running part synthetic 5-30. thanks...
i like how he snuck that into a random thread

um 3k miles is your answer.

to the original poster: you probably arent going to get much hp out of an intake and exhuast, its just a little 1.6L engine. but hey its worth a try...and remember: louder != faster
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