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Old 01-08-2003, 08:57 PM   #1
MidnightRU02
Scooby Newbie
Member Sales Rating: (1)
 
Member#: 28608
Join Date: Nov 2002
Location: Huntsville, AL
Vehicle:
2004 STI
Obsidian Black Pearl

Thumbs up RS*R Downpipe

All I can say is, this thing is perfect. It is 3" piping and has a huge cast bellmouth. In my opinion the cast bellmouth has to be better than the others that piece pipe together because it does not have rough edges or welding slag inside the pipe. In other words it is a very smooth transition into the 3" pipe. It fits perfect and all of the attachment points line up perfect just like the factory pipe unlike most of the other downpipes that I have read horror stories about. Oh and it is fully polished so it almost looks to nice to put under the car. Turbo lag in 1st and 2nd is greatly reduced(it spools almost as fast as my wifes turbo Miata with a ball bearing T28).

Go buy one!!!!!!!!

I bought mine from Garret at World One. His price can not be beat, and he is a nice guy that runs a great business.
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Old 01-12-2003, 01:45 AM   #2
Gonz
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Member#: 18642
Join Date: May 2002
Chapter/Region: MAIC
Location: MAIC
Vehicle:
2005 Impreza WRX STi

Default

hey,

what cat back exhaust did you hook this up to? can it be bolt on to the stock cat back?

Also how much LOUDER did your car get after taking out both cats?


G

Last edited by Gonz; 01-12-2003 at 08:00 PM.
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Old 01-12-2003, 11:16 AM   #3
MidnightRU02
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Member#: 28608
Join Date: Nov 2002
Location: Huntsville, AL
Vehicle:
2004 STI
Obsidian Black Pearl

Default

Hey Gonz,

The stock cat-back will bolt up with no problem but it will look like the downpipe is trying to eat the cat-back it is so much bigger in diameter.

At idle, it is a little louder. Not very noticable but we did have a stock car to compare it to. WOT opens up a bit compared to stock but I have not had anyone that has been in the car complain about the sound. It sounds good.

The main difference in sound is that you can now hear the turbo spool when you are in boost. I think it is because the stainless tubing does not have the same sound dampening qualities as the stock cast pieces. Personally, I bought a car with a turbo and do like hearing what I paid for!!!

I am having a cat-back built with a 6" round Magnaflow muffler next wednesday. It will be mandrel bent 3" and should be similar to the Turboxs exhaust. I just wanted the round canister muffler rather than the rectangular Magnaflow that Turboxs uses. I will comment on sound after it is installed.


The only other thing that I think I should comment on is that when you replace the stock downpipe, you are also replacing the donut gasket at the cat-back. I think this is typical with most aftermarket downpipes. Since you take away the flex joint and the downpipe is bolted to the motor, transmission, and car body, you do notice that there is less flex in the exhaust system but it is minimal. I have not actually had anyone comment on it, I just noticed it myself (I am pretty picky about sound, vibration, etc.)

In all, I think this is a perfect upgrade for the WRX and it is less expensive than most. Alot of bang for the buck horsepower!!

MRU02
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Old 01-12-2003, 08:11 PM   #4
Gonz
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Join Date: May 2002
Chapter/Region: MAIC
Location: MAIC
Vehicle:
2005 Impreza WRX STi

Default

thanks for the follow up. I just have the Prodrive axle back right now and a TurboXS stage 1 unichip. My next step is a Downpipe and to retune for Stage2

I was really concerned that a catless pipe might be too loud. Sounds like it's going to be OK. Guess I'll post my views after I get this pipe.

Thanks,

Gonz.
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Old 09-23-2003, 12:43 PM   #5
scoobystas
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Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default Installed Helix downpipe

I installed a Helix downpipe this past weekend from Gruppe-S. The turbo sound is very noticable and it mates perfectly to the stock catback. I'm alittle disapointed with the gains. I don't really feel it. Maybe i need to reset my ecu. I will get an uppipe and maybe then i'll feel a bit more difference, a bit more oomph. All i know is that without two of those cats, my car reeks like stinky exhaust fumes. It's pretty bad.
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Old 09-23-2003, 11:16 PM   #6
Shaggee
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Join Date: May 2001
Location: Queens - Albany NY
Vehicle:
2002 WRX
Black

Default

Gruppe-S, Invidia, RS*R.. Arent they all they the same pipe???
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Old 09-25-2003, 08:59 PM   #7
Gruppe-S
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Join Date: Aug 2002
Location: Lake Forest, CA | 949-457-1234
Vehicle:
2006 949-457-1234
949-457-1234

Default ...

Hey guys,

Sorry to hear about the lack of power gains with your setup. We generally like to package the Helix downpipes in our Powerpackage #1, which includes Helix uppipe, downpipe, and cat-back exhaust system which yields a 30+WHP GAIN on all the cars we have tested on (with no additional modifications). Without one or more of these components you will probably not be seeing these gains... In terms of exhaust flow, the rule of "being as strong as the weakest link" applies.

As for the downpipes, the Helix downpipe is made separately of both RSR & Invidia. Having tested both, we feel that the Helix downpipe offers better clearance as well as smoother head design than these other two.

Please contact us for any questions! Thanks,

Gary
Gruppe-S
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