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Old 04-04-2002, 08:55 AM   #1
hobun2
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Question 1.8 headers

Hi everyone! I've tried to loggon as often as possible since I've joined this place! It's just plain awesome!!! I even think about this place when I'm sleeping...

Anyways, I have a few questions regarding modifying the exhaust of my 1.8l.

1) Are there any headers from other Subaru models that would fit my car? If not, are there any suppliers who makes them?

2) Is changing my downpipe to a larger diameter will help to obtain more power? If so, are there any recommended diameters?

3) Are there any cats (catalytic converters) from other Subaru models that could fit and enhance the flow of my exhaust? Or should I just empty it and make it straight through? I live in a place where emission laws are not as tough as in the USA and I know some people who've emtpied their cats and welded a pipe inside the shell to make them appear legal.

4) Any suggestions as for which brands I should use for the muffler? I'm currently considering a universal muffler since I can't find anythying that seems to be made for my car.

My car is currently stock: no turbo EJ-18 and FWD.

Any comments or advice is greatly appreciated! I love this place! I-Club ROCKS!!!
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Old 04-04-2002, 01:55 PM   #2
RaceCarRiot
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hiya, i saw your other thread, and fortunately being at the cutting edge of 1.8L FWD performance or something like that, i can help.

- headers you'll have to have made. cams...try checking out www.paeco.com...they might be able to custom make a pair, but they'll be EXPENSIVE.

- any exhaust that fits an RS or other 1st gen impreza (GC8) will fit our cars. cat backs require a slight mod to the flange that meets up with the header on FWD cars. any exhaust shop should be able to do this. your choices on this are pretty much wide open...stromung, brullen, greddy, tanabe, etc. etc. or if you just get a back box (from the axle back), it's a direct bolt on. stromung sells their rear sections separately, and there are also ones available from STi, and prodrive, although both are rather expensive, and somewhat difficult to come by. i'm running the prodrive, and it's a beautiful piece of equipment. try contacting luke at tire rack (moderates the suspension/wheels/brakes forum...tire rack now carries all of prodrive's stuff). stromung also sells their midpipes separately. if you're having something made, don't go over 2.5" diameter for an n/a engine, otherwise you'll lose torque.

- random technologies makes a hi-flow cat, but i don't know if you'd have any fit issues.

- for air intakes, try finding an old JC sports intake for 93-99 cars, or get the cone filter adapter from larry ganz @ www.imprezars.com...or try emailing accuritperformance.com...i think they may make one now.

- lightened pulleys will get you a little more power by reducing drag on the crank. www.imprezars.com

- the proECM chip will help, although no one is sure exactly what it does. but your car will feel quite a bit quicker, provided you're running premium gas. imprezars.com once again.

- lightened flywheel will help the engine get up to speed quicker.

-being FWD, we have the advantage of a much lighter car, although we have less traction, and really TALL performance sapping gears.

basically, like i said, anything from any other impreza is pretty much interchangeable, but there are a few exceptions, like the slight difference with the exhaust, short shift kits don't work on any car made before 96 or 97 because of a different linkage, etc. etc.

i'm running the intake, exhaust, pulleys, and chip, my car still isn't fast per se, but it's certainly quick enough, and loads of fun to drive. and in the end, isn't that what it's all about?

good luck!
-adam-
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Old 04-04-2002, 02:09 PM   #3
hobun2
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Smile

Man!!! Thanks for the advices! I'm gonna take a look at that! As I understand, I'm REALLY limited to what I can do on the car.

But it's making it more challenging! Since I don't know much about mechanics (which is why I have a friend who does).

So I can go as big as 2.5" for the piping? Would that be too loud or just good enough. I'm also thinking of emptying the catalyser and make it straight through to improve flow. Is that a good idea?
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Old 04-05-2002, 03:42 AM   #4
Kostamojen
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if you put a 2.5 on there you will kill ALL your low end power... 2.25 at most for the 1.8!

MRT makes a whole exhaust for the 1.8 including headers... and I compaired some RS headers to our headers the other day, and I think they can bolt up on and thus you could do the whole exhaust without changing the flange (only if the 02 sensors can plug in)
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Old 04-05-2002, 12:56 PM   #5
hobun2
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Thank you guys!

I'm gonna go to a local shop and see how much it would cost to have a customer-made exhaust. Apparently, there's a guy I know who paid about 300$ CAD (~190$ USD) when he increased the entire diameter of his exhaust including making his cat straight pipe! Of course, that's not including the headers and the muffler, but it's still sounds pretty cheap to me. He's had it done for 3 years now and the car still runs great.
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Old 04-08-2002, 05:30 AM   #6
Joe Alejandro
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Quote:
Originally posted by Kostamojen
2.25 at most for the 1.8!
2.25" stilllll might be a little too big hobun2, unless you want your top end more than down low. For engines below 2000cc, 2" is supposed to be the right size. Joe
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Old 04-08-2002, 05:35 AM   #7
hobun2
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Quote:
Originally posted by Joe Alejandro


2.25" stilllll might be a little too big hobun2, unless you want your top end more than down low. For engines below 2000cc, 2" is supposed to be the right size. Joe
How much power can I extract going 2"? How about 2.25"?
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Old 04-08-2002, 08:54 PM   #8
AudioFan
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Quote:
MRT makes a whole exhaust for the 1.8 including headers
Im thinking on it for my car

Quote:
For engines below 2000cc, 2" is supposed to be the right size
I also read these on a car mag
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Old 04-10-2002, 10:41 PM   #9
Joe Alejandro
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Quote:
Originally posted by hobun2


How much power can I extract going 2"? How about 2.25"?
I had 2.25" piping before. Low end sucked a$$ like *****. Went to the shop and replaced it with a 2" mandrel bent pipe, it reshaped my power band, especially low end. Joe
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Old 04-11-2002, 07:59 AM   #10
hobun2
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Joe Alejandro -
2" seems to be the right option, but you got 2" mandrel-bent piping. However, I can't find a garage who can do that here in Montreal. I've asked in www.subaru-montreal-club.com and some people referred me to a garage which is about 3 hours drive away. I can't seem to find other options.

Would 2.25" be ok if it was not mandrel-bent? Perharps 2.5"? I understand mandrel-bent is the way to go as far as piging is concerned, but like I said, I'm having a hard time finding a garage who can do that in Montreal...

BTW, thanks for the advice my friend!
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Old 04-11-2002, 09:33 AM   #11
RaceCarRiot
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where do i find these mythical MRT headers?? i tried looing on their site and didn't see them...

i just need the headers and piping to the backbox though...i'm NOT giving up my prodrive backbox!

-adam-
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Old 04-11-2002, 10:05 AM   #12
AudioFan
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Drop a email to MRT, They take some time to answer. This is what they told me
Quote:
This is what your after:

SUWAE030AA
Sports exhaust KIT, including special hand made collector manifold from engine outlet, new high flow catalytic converter, 1 piece centre pipe and muffler assembly, rear sports muffler, 2 inch. outlet. constant bends, constant radius 2 in. Dia. All flanged joints. All in alloy coated and painted steel . No U Clamps.
This system is designed for the EJ20 (1994cc naturally aspirated engine) but will also fit the EJ18 (1800cc naturally aspirated) as well
I wrote an email to all the US MRT distributors, And only a few got back to me, And found the best deal with Parts at Langston Subaru langstonparts@alltel.net; parts@langstonsubaru.com, 1-877-563-4WDS attn to Brian , Hes been helping me out, very good service, I would be ordering from them, just waiting to get some more fitment info for my car.
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Old 04-11-2002, 06:40 PM   #13
RaceCarRiot
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thanks audio fan...i got the MRT catalog this morning...so in case anyone wants to see (sorry about the less than stellar quality...had to get the file size down)...

i'm thinking about buying the headers and getting a midpipe made, since there's NO way i'm giving up my back box. with the midpipe, it sounds like you have to use their muffler...
Attached Images
File Type: gif mrtcatalog.gif (23.4 KB, 61 views)
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Old 04-11-2002, 06:52 PM   #14
Reciprocity
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Slightly off topic...but Langstrom Subaru ROCKS! Great people, great service, great prices...I highly recomend them!

NC
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