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Old 02-15-2001, 08:35 PM   #1
Spiderman
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Join Date: Feb 2001
Location: Midlothian
Question Intake and Exhaust

Looking for anyones opinion on specific intakes and exhausts. What are you impressed with and what would you suggest for my 99 RS?

Thanks
John
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Old 02-16-2001, 02:53 AM   #2
tmat3
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I have a MY01 RS. I have Larry's intake and Stromung. I installed the exhaust first, then a month later, the intake.

Exhaust gave me more pull than stock after installation. I was impressed. The intake gave me even more pull after installation. I was amazed. The combination of both is extremely good!

Larry has made the intake for MY99 (MAF sensor), I believe.
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Old 02-16-2001, 03:30 AM   #3
hacman
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Larry hasn't made his yet for the 98/99 MAF based ones. We're anxiously awaiting! Should be done soon hopefully! Cobb ( Cobbtuning.com ) should be done with one too pretty soon.
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Old 02-16-2001, 04:26 AM   #4
pimpomtic
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Well, I'm still whating on my borla header and cat-back. Plus my cobb tuning intake. So they will be here soon. And I will see what gain's I get and lose..
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Old 02-16-2001, 10:15 AM   #5
RS_NW
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I just ordered COBB tuning Intake along with the N/A 5Zigen Fireball exhaust. I promise to post when they are here and on my car.
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Old 02-17-2001, 10:14 AM   #6
BrysImpreza
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WEll I have a 1997 Impreza L and we have basically the same intake set up. I went to www.Kartboy.com and got a MAF Filter mount and a K&N Cone filter (RU-3580) from advanced auto parts for $33.99!!! I haven't put mine on yet, but my friend did the same thing with his 1996 L and his car pulls like a mo-fo!!! Even driving like an ass he's getting about 300 miles per tank! So thats my suggestion for an intake, it'll save you some money and time, plus if you have to bring it in to the dealership for work you can pop it right off and throw the stock stuff back on.
As for exhaust, everyone says 2 or 2.25, on most 4 cylinders you lose alot of low end power with 2.5 and above. As for me I'm putting a Dynoflow muffler on mine cause they aren't very loud and are less restrictive.
Hope that helps a little.
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Old 02-17-2001, 10:23 AM   #7
JGard
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just random preferences, i like the JC sports intake, and the STi V5 exhaust
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Old 02-17-2001, 11:42 AM   #8
P.K. Motorsports
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1. Rallispec intakes are probably good for about as much increase in flow as you can get. You could also get a Cobb intake and a Kartboy MAF adapter, then cut the tube back enough to get your MAF sensor in there. JC/Minnam/Weapon*R tubes are OK as components but they all have exposed cone filters sucking hot engine bay air. By the time you rig up a cold air version of them you are better off just starting with the Rallispec or Cobb.

2. For an NA car the MRT exhaust will kick the crap out of anything else currently offered, period. Equal length headers, high-flow cat, need I say more? You could spend twice as much on Borla headers and a Rallispec exhaust and I would bet that in an impartial test the MRT will still dyno out better, i.e. higher peak power and possibly a smoother torque curve as well.

3. Please search before asking these types of questions, they have been covered hundreds of times.
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Old 02-17-2001, 10:37 PM   #9
ImprezaRS dot com
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I currently sell a cone filter conversion for the 97-99 for $69.95 shipped, which is very competetive with what was suggested here - includes filter, maf adapter and bracket (oil kit sold seperately). The beauty of these is not needing an AFC to tune the car.

<IMG SRC="http://www.imprezars.com/images/filtermaf.jpg" border=0>

I have a machine shop working on 3" MAF adapters for a cold air version to be released soon. I fired the first machine shop for shoddy workmanship, hence the delay.

Larry www.ImprezaRS.com
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Old 02-18-2001, 02:27 PM   #10
gtguy
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That's interesting stuff, P.K.. Did you have an opportunity to compare the MRT system to something like a Borla/Stromung setup? I know that Stromung is considered the gold standard for mufflers in these parts, so it's interesting to hear that something will "kick the crap" out of it.

Kevin
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Old 02-18-2001, 04:47 PM   #11
P.K. Motorsports
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4-wheel dynos are very hard to come by, so we will probably never have the test I suggested. But the MRT setup has already been dynoed on an otherwise-stock RS with a control run as 100% stock and something like 10% more peak power was put to the wheels. That's a pretty tall order for ANY system to match - in the B18C crowd as well as the small block Chevy crowd 10% from exhaust work is pretty darn respectable.

As for the Stromung, I really doubt there would be a statistically significant difference between it and the 2.25" muffler used by MRT in their system either way. The Borla headers are not bad by any means, but the problem is that they maintain the stock asymmetric design and that sharp 180 degree bend directly after the header flange. This is great if you have a turbo and need places to hook up your up- and downpipes, not so good otherwise. Look at the way the MRT brings the secondaries together and then straight into the high-flow cat, there are no sharp turns anywhere. This is more or less how big power is made from an NA engine in the V8 world too - if you don't believe me there was a HotRod issue last year devoted to exhausts which had a long article on the physics of exhaust and how more power can be wrung out of an engine by adjusting the exhaust. The picures they had in that issue showed thinking which is squarely along the lines of the MRT and not much like the Borla.

Admittedly the Borla system is the best for a turbo, since it would be totally impractical to attach up- and downpipes to the MRT. But for peak NA power an equal-length header rules.

So yeah, I think that on an NA car the MRT will better the Borla/Random/Rallispec combo and yes, kick the crap out of just the Borlas plus a catback.
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Old 02-19-2001, 10:08 PM   #12
hacman
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Hey Larry - that pic looks familiar.

That install was pretty simple, and I didn't have to get any extra hardware. I'm gonna keep the intake piping as is until the CAI setup comes out.

Noticed a bit more pull in the upper revs, and the sound level at WOT barely went up. Sounds a little deeper, but not much. Oh, and there is a whistling from the intake now, which is more than likely that snorkel piece (blowing across a bottle....).
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