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Old 12-31-2003, 04:51 PM   #1
forced4
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Thumbs up Stromung 3" DP w/ divorced wastegate tube

I recently bought the Stromung 3" DP w/ divorced wastegate tube for my 02 WRX wagon. I did install a gutted OEM uppipe at the same time FYI.

Fitment: Everything lined up well and there were no issues with clearance. I reused the downpipe gasket w/ some copper gasket seal applied. Move the drain tube on the firewall like all other downpipe installs.

Construction: Stainless steel with mandrel bends. Flange around main tubing separates the wastegate flow. Good welds all around with no slop or slag. There were some shavings (or what appeared to be) inside both tubes but they were easy to remove before installation. The entrance opening is 3" round with a 1.5" wastegate tube. The exit opening is 3" x 2.5" in order to fit properly with the OEM 3rd cat section.

Performance: I have only put ~50 miles on the car since the installation so the ECU is still learning. Spool is increased ~2-300 rpms and EGTs have dropped at cruise ~50deg Celsius. My EGT is tapped on the driver's side exhaust manifold. I went from ~ 825C to ~ 775C at a steady 75mph in 5th gear. Every gear has better pull than before. I would guess (conservatively) a 25hp increase is reasonable for both the uppipe and downpipe. I am running a Cobb Stg1 ECU upgrade as well so I guess I am at Cobb Stg1.5 currently I plan on getting the Stg 2 reflash in the future. I did install a MIL fix for the rear O2 sensor with no CELs so far.

Sound: You can hear the turbo spool now and the full on boost is ~ 25% louder. I don't mind the extra sound but then again I do have the original Borla catback installed too. In other words, I like it loud. With the 3rd OEM cat section still installed there is an increase in tailpipe sound level for sure. How much you say? I have no idea. But it sounds nice to me.

Price: $189 shipped from Teague Auto. Great bang for the buck.


EDIT: I now am using the Cobb Stg2 Reflash. The car now has much improved top end over stock or even Stg1. Since I installed the MIL fix, I can not comment on the reflash taking care of CELs though. 3000 miles and still
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Last edited by forced4; 07-01-2004 at 06:20 PM.
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Old 12-31-2003, 04:57 PM   #2
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Default Re: Stromung 3" DP w/ divorced wastegate tube

Pics can be found here
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Old 01-01-2004, 01:25 AM   #3
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Sweet, what a killer price! Nice review.

Let us know what the EGTs are like after you get the stage 2, I bet they'll go back up from your car running leaner.
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Old 01-07-2004, 04:54 AM   #4
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I've had mine on for about over a month and I love it! I also got the Stromung pipe w/ the small cat in it (3in.) that bolts up to it. A PDE U.P. was also installed at the same time. No problems yet (1500 miles or so on them)!
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Old 01-07-2004, 08:34 AM   #5
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forced4:

What boost levels is your Cobb Stage 1 maintaining with the new downpipe and gutted uppipe? Obviously Cobb recommends going with Stage 2 for better management with your new mods. I'm curious about the power improvement you are experiencing over the stock Stage 1. Thanks again.
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Old 01-07-2004, 09:00 AM   #6
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Talking more boost cap'n!

I am seeing around .05 kg/cm^2 more boost (~1psi) with the DP. I think my ECU is still learning to control the boost better. Cobb Stg 2 should get the boost levels totally stablized.

I am maxing out at 1.15 kg/cm^2 in 3rd thru 5th. A little less in 1st and 2nd gears.

Power has increased from ~2700 rpm to redline. I find it is easier to start from stop now. Of course I can hear the turbo spool much more now.

I did install a gutted uppipe at the same time and that will help the low end, however the DP is helping top end IMO.

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Old 01-08-2004, 06:54 PM   #7
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Forced4:

Do you feel your stock cat is keeping your exhaust from really breathing?

Subiestyle:

Your cat is a seperate piece you bought from stromung, or is it the downpipie w/ the cat and the OE style turbo outlet housing?
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Old 01-08-2004, 10:15 PM   #8
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Talking not a biggie

Quote:
Originally posted by slvwagon
Forced4:

Do you feel your stock cat is keeping your exhaust from really breathing?
Honestly I probably am leaving 5+ HP on the table but I still want one cat in my system so I don't stink up the place. The main increase in performance is the downpipe design and removal of the 2nd cat in the exhaust system.

Plus it is a lot cheaper to use the stock 3rd cat section than buy a new one that won't really increase performance that much.

Last edited by forced4; 01-08-2004 at 10:27 PM.
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Old 01-09-2004, 03:45 PM   #9
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so with your stock 3rd cat still in place there was no change in smell?
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Old 01-09-2004, 03:50 PM   #10
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Quote:
Originally posted by Focus4
so with your stock 3rd cat still in place there was no change in smell?
Nope no rotten egg smell for my Suby!
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Old 01-14-2004, 12:15 AM   #11
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slvwagon- I have the new cat-pipe thats mates up w/ the new 3in D.P. W/ a mircale fire 5Zigen cat-back. That Cat that comes in that Stomung pipe is a Metallic Substrate-cat, Instead of the Ceramic Substrate-cat that come w/ the car. That new cat is soo small! Everyone that has looked under my car has laughed, Because they can't believe that's my only cat. It does't even really looke like a cat. It can be that much bigger than my fist! The pipe is 3in & the cat is probably about 3 1/2 or just a little bigger Whlie it's only about maybe 5in long. It looks like a little resonator. And yes that little thing cuts out all the smell & flows like it's not even there! It's no wonder why that damn pipe cost soo much!
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Old 01-16-2004, 12:44 PM   #12
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i really like the cat section of this exhaust, but i had fitment issues with teh downpipe. the divorced wg tube portion butted up real tight with a portion of the frame, which i dont tink its supposed to do. eventually im gonna dremel some of that frame off so that the pipes have room to expand, but jeez i wasnt expecting fitment issues.

FWIW i have an 04.

also gettin some serious boost spiking, but thats probably because of the cold (0 degrees here tonight), but i was hittin 1.16 bar on stock ECU and just stromung dp/catpipe. also alittle wg flutter but otherwise okay.
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Old 01-16-2004, 09:06 PM   #13
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Scott from Stromung says the 3" primary downpipe with the divorced wastegate is good for 12hp ALONE.
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Old 01-17-2004, 05:06 PM   #14
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Cool more pics

More pics for your enjoyment!



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Old 01-18-2004, 12:19 AM   #15
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Installed my new Stromung downpipe + Stromung high-flow cat midpipe section this weekend. Install went very smooth. No fitment issues at all. The divorced wastegate tube clears the frame on my car by approximately 1/4". This is on a MY 04 car.

Car is running better than ever after an ECU reset. No boost spiking or wastegate flutter has been seen.
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Old 01-19-2004, 12:00 PM   #16
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to clarify, i dont know if its the pipe or not, but ive been told that the fitment issues im dealing with could be caused by a general shift in the motor from one car to another. i guess when the motor is anchored into the engine bay, there is some leeway to its orientation right to left.

my car seems to be unfavorably moved to the left, while others are far enough away from the left that they dont have fitment issues.

im prolly just gonna make a dimple in the divorced section enough so that i get some clearance.
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Old 01-21-2004, 12:07 AM   #17
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I'd rather give the subframe a few good wacks w/ a big hammer before I messed up that nice new pipe! (won't hinder performance)

Will.
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Old 01-25-2004, 10:32 PM   #18
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Just installed my Stromung dp and also had fitment issues. I have an 03 wagon and the wastegate tube butts right up to the back of the engine bay. I am not sure what I am going to do to fix it. I have to soon though as the sound is going to drive me crazy. It sounds like I am driving a sherman tank whenever I am on the throttle. Any ideas other than the hammer to the firewall?

John
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Old 01-26-2004, 04:17 PM   #19
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i thought maybe a grinder to the subframe, but i dont have a grinder...and about the sherman tank, i know what you mean lol sounds kinda cool tho hehehe

i aint gonna get a chance to change it till march, so if any of you try something that works before then, lemme know k?
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Old 01-26-2004, 10:12 PM   #20
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See: http://forums.nasioc.com/forums/show...hreadid=486579

This thread will address all fitment issues.
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Old 02-08-2004, 10:50 PM   #21
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OMGHi2U update

My DP has been on over a month now...now issues to report except more power


Will
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Old 02-09-2004, 07:41 AM   #22
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Awesome DP / catted MP - ran a 13.74 in the 1/4 mile with them and a Perrin uppipe:

http://forums.nasioc.com/forums/show...hreadid=498938
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Old 03-16-2004, 12:17 AM   #23
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What a great DP! Easy installation, great fit along with Speedmonkee heavy duty gaskets. Nice added sound. Rest of my exhaust is stock minus the Prodrive axle back. Made some GREAT power, inscreased spoolup pretty drastically (in my opinion). Well worth it and I still retain the oem 3rd cat.

Here's a sound clip of the downpipe with the Prodrive WRSport axle back.

Right click - Save as

Last edited by InfamousDX; 03-20-2004 at 08:35 PM.
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