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Old 05-06-2004, 11:39 AM   #1
powerlabs
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Default Installed random tech high flow cat converter: Full exhaust review.

Currently my set up is as follows:
1999 Impreza 2.5RS with:
Injen Cold air Intake
Borla Headers
Random Tech High Flow Catalytic Converter
Magnaflow 3.5" resonator
Borla Catback
Polyurethane Exhaust Hangers
Unorthodox Racing Under Drive Pulley
Exedy Pro Street Clutch
Short Throw Shifter w/Polyurethane Bushing
STI Transmission Mount
Apexi S-AFC

For handling /braking I have Front strut bar, rear sway bar, Brembo brake kit and Kuhmo Ecsta MX tires. I've got a couple other things you can check out at my car page but this here is a review partaining to the high flow cat:
I installed it with Borla Headers and Catback already in place. Started the car; it is NOT loud in that set up, as many people have stated; in fact it was hard for me to tell if it was even louder than with the stock cats on. It did backfire more though (this got better with some more AFC fine tuning).
HOWEVER the random tech cat added this raspyness to the exhaust tone; a sort of metallic scratching sound that I did not like at all (with just the Borla Headers + catback the engine made a wonderful deep low grumble that I really enjoyed). I had the midpipe cut and added a 2 1/4 inch pipe, 3.5" dia 14" long Magnaflow resonator. That eliminated the raspiness completely. The exhaust sound is slightly less deep than it was before, but it is not loud (my Injen CAI is louder), and it sounds very unique; deep and sporty
Power? The car will pull through 1st gear so fast that I have to keep my hand on the shifter to be able to shift it into second before it taps out the redline. Its definitely torquey with all these mods! I must say that the power difference from just the cat was slight though, but since I plan on adding cams, I figured I'd benefit from having a completely free flowing intake/exhaust system.
In sum; I am happy. I probably blew 1300 dollars on the full exhaust+ installation but it makes noticeable power and gives me exactly the sound I want: quiet, but distinct. Highly recommended
Look forward to video when I get back from Brazil on the 18th.

BTW: I think I have every single bolt-on power mod possible now? I've been searching for other things I can do to my engine to make it more powerful and it seems like from here the only route to go are cams, heads, reflash, etc... Anyone care to comment?
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Old 05-06-2004, 01:47 PM   #2
SjYankee006
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TTIWWO movie/sound clips! I know they won't do it justice but I'd like to hear it anyways. And I think cams are your next best bet.
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Old 05-06-2004, 02:07 PM   #3
linsavy
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Interesting stuff. You didn't mention a light fly-wheel. (just helping you spend money )
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Old 05-06-2004, 02:23 PM   #4
RS_to_WRX_swap
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sounds like you have a nice car. btw on your web site you claim 200 hp at the wheels which seems optimistic. my guess would be more like 200 at the crank. which is still a fast car
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Old 05-06-2004, 03:10 PM   #5
Nicklbrso
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Quote:
Originally posted by RS_to_WRX_swap
sounds like you have a nice car. btw on your web site you claim 200 hp at the wheels which seems optimistic. my guess would be more like 200 at the crank. which is still a fast car
I would 2nd that. The flywheel idea is a good one too.
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Old 05-07-2004, 07:23 AM   #6
powerlabs
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Ops, my bad! I most certainly didn't mean at the wheels
Does the flywheel really help? I've heard they make the car jerky...
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Old 05-07-2004, 07:41 AM   #7
NicGordon
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Quote:
I got the 1999 black coupe. This is the rarest Impreza around (1999 was also the last year they made coupes) ; there are less than one thousand of these in the United States!
Hmmm...interesting '99 was the last year of the coupes? My car must be imaginary then!
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Old 05-07-2004, 08:46 AM   #8
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Quote:
Originally posted by NicGordon
Hmmm...interesting '99 was the last year of the coupes? My car must be imaginary then!
Thats not true there are 2001 RS coupes also.
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Old 05-07-2004, 10:14 AM   #9
powerlabs
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So what exactly is the deal with the black RSs being the most rare ones? I'm sure I've seen this written on several places before.
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Old 05-07-2004, 10:58 AM   #10
linsavy
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Some people run both the light flywheel and light crank, but this can cause some launching problems. You can deal with it if you don't do a lot of stop and go. (doesn't look like that is a problem for you)
The light flywheel is a much bigger gain than the crank pulley, especially on the 2.5l which has a relatively heavy flywheel.
Anybody who has swapped them, swears by them.
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Old 05-07-2004, 03:55 PM   #11
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Quote:
Anybody who has swapped them, swears by them.
I swear by them Is a really good mod, I also have a lighten crank pulley and its really not bad. There is a noticeable difference in pull and how the car revs. You if you look you can usually find a slightly used flywheel in the classifieds.
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Old 05-08-2004, 10:24 PM   #12
Section 8
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I swear AT mine all the time. I have the 9.5 pound Fidanza with Club Racer cams. Its a pain in the ass. Stick with a 12-15 pound flywheel. I drove a friends car with the Jun flywheel, and its perfect. You might want to get a littel heavier with an agressive cam (other than a stage 1 type).

cheeRS,

Greg
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Old 05-08-2004, 10:48 PM   #13
Patrick Olsen
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I'm in the same boat as Greg, although I just have the Cobb Street cams. We've discussed this in previous threads - the throttle is very on/off at anything under 2000rpm, makes it very hard to drive smoothly in traffic.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 05-09-2004, 12:39 AM   #14
Section 8
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Even though my post seems like a downer. It is a good mod, and I feel much better shifting like a fat head (less shock loading on the gears).

Get stuck in stop and go up an incline... UGH!

Greg
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Old 05-09-2004, 12:40 AM   #15
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Got anymore info on the resonator? I have one on my car but still have some rasp, I did a quick search and couldn't find any details on the Magnaflow site.

Thanks
Buster
Mid-Atlantic Region Members Site
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Old 05-11-2004, 05:50 PM   #16
powerlabs
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Its a stainless steel resonator 3.5" OD, 2 1/4" ID. It costs 64 dollars and any magnaflow dealer will have it. When I get back from Brazil IŽll get the part number for you.
BTW it is heavy
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Old 05-11-2004, 07:45 PM   #17
Supraru
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How's the exedy pro street clutch? I'm hopefully gonna get one. Does anyone know if that is basically equal to like a stage one clutch? My friend had a stage 3 with a 9 lb flywheel and I think I'd destroy my tranny with something like that. He now has an unsprung stage 5 clutch. I think something better then stock will be fine for me to get through the next 2 years then goodbye engine and tranny.
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Old 05-11-2004, 07:47 PM   #18
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Quote:
Originally posted by powerlabs
So what exactly is the deal with the black RSs being the most rare ones? I'm sure I've seen this written on several places before.
I'd have to say that Arcadia (I think) Green is the rarest, then maybe the Black since they didn't make that color in 00'.
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Old 05-12-2004, 09:58 AM   #19
dmross
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Default resonator

The resonator got rid of the raspyness? I HATE my exhaust sound on the RS because of the RandomTech cat. I think I will do the same if you say it helped.
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Old 05-12-2004, 10:07 AM   #20
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Quote:
Originally posted by Supraru
How's the exedy pro street clutch? I'm hopefully gonna get one. Does anyone know if that is basically equal to like a stage one clutch? My friend had a stage 3 with a 9 lb flywheel and I think I'd destroy my tranny with something like that. He now has an unsprung stage 5 clutch. I think something better then stock will be fine for me to get through the next 2 years then goodbye engine and tranny.
I just had the exedy clutch and 12lb flywheel installed on my RS and I love it. It feels great. It takes a little bit to get used to, but once you adjust, its fine.

I woudn't go lower than 12lbs though for the flywheel.
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Old 05-12-2004, 04:46 PM   #21
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Quote:
Originally posted by dmross
I just had the exedy clutch and 12lb flywheel installed on my RS and I love it. It feels great. It takes a little bit to get used to, but once you adjust, its fine.

I woudn't go lower than 12lbs though for the flywheel.
how heavy is the stock flywheel?
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Old 05-12-2004, 06:00 PM   #22
Sly_dE
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I think it weighs something like 26lbs Maybe even more. A good idea if you've already done everything else you can think of.
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Old 05-12-2004, 06:42 PM   #23
Supraru
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I had another question. Right now my current set up is Borla header, Random tech cat, Apexi midpipe (old n1 and had an extention made) and a blitz nur spec axle back. I was thinking of getting rid of the resinator just because I thought it would sound better and when the guy made the extention he made my exhaust just a little crooked. So what it sounds like if I get rid of the resinator my exhaust will sound really pingy and metalic? It kind of sounds like that now but that's because I have a crack in my header that is gonna get fixed. When it got welded up the first time it went away. I'm getting the midpipe for free because my friend owns the shop but I don't wanna have him do it if I'm gonna put the old one back on. Thanks for your input.
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Old 05-12-2004, 08:43 PM   #24
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Quote:
Originally posted by Sly_dE
I think it weighs something like 26lbs Maybe even more. A good idea if you've already done everything else you can think of.
30.

BTW..I have a 12.9lbs Exedy flywheel and I didn't notice a single difference at all.......in drivability. Performance was like adding an extra 15 - 20hp to the car.
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Old 05-13-2004, 04:13 PM   #25
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So would the 12.9 lb exedy flywheel made for the ej25 fit on a ej22 or even a ej18? I would love to put one on my new motor before it gets installed...
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