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Old 07-19-2003, 11:15 AM   #1
offset
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Default What is the best downpipe for the STi?

So does anyone have any opinions as to which DP is working the best with the STi? And does your opinion reflect the DP with the factory exhaust or an aftermarket?

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Old 07-19-2003, 02:19 PM   #2
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Default Re: What is the best downpipe for the STi?

Quote:
Originally posted by offset
So does anyone have any opinions as to which DP is working the best with the STi? And does your opinion reflect the DP with the factory exhaust or an aftermarket?

offset
I have TurboXS RFL-TI turbo back. It has a 4" down pipe and I like it a lot!

A picture of it installed here.
http://home.kc.rr.com/cerberus/Downpipe.jpg
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Old 07-19-2003, 02:29 PM   #3
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Default Re: Re: What is the best downpipe for the STi?

Quote:
Originally posted by Hummer


I have TurboXS RFL-TI turbo back. It has a 4" down pipe and I like it a lot!

A picture of it installed here.
http://home.kc.rr.com/cerberus/Downpipe.jpg
Wow that sucker is big!!! what did you use to wrap it around in? does it contain the heat well?

thanks, Ghost
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Old 07-19-2003, 02:44 PM   #4
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Invidia downpipes are Teh winnar. Far better than the TurboXS in quality. No idea on power but my guess is that they are equal in that department.

Oh and the Invida keeps the stock location for the flange between the catback and the downpipe so you don't have to play with adaptor pipes like you do if you run a turboXS with a different catback.
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Old 07-19-2003, 05:32 PM   #5
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Godspeed !!!

an extra bung for a large A/F, no CEL no cats
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Old 07-19-2003, 05:43 PM   #6
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Default Re: Re: Re: What is the best downpipe for the STi?

Quote:
Originally posted by silver ghost


Wow that sucker is big!!! what did you use to wrap it around in? does it contain the heat well?

thanks, Ghost
I used DEI exhaust wrap with a 1500 degree silicone spray coating.

MY TurboXS is excellent quality. I have purchased a lot of aftermarket exhausts and this one is sweet. Also, I have never had to replace ANY aftermarket exhaust on any car for "quality" reasons.

XT6wagon took a cheap shot IMHO. What is this based on?
"Invidia downpipes are Teh winnar. Far better than the TurboXS in quality."

You also assumed that they will be the same gains but I doubt it. TurboXS has 4" mandrel bent T304 stainless and the Invidia is 3" mandrel bent stainless.
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Old 07-19-2003, 06:06 PM   #7
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I've owned both at the same time. No contest in quality. The TXS one looks like it was made in someone's driveway... I know cause I used to make headers in mine. The Invida piece is very very well done. Also TXS loves to use crap bolts in european sizes so you can finaly get your 13mm and other random wrenches dirty. Gee thanks.

Power? All I know is that the Invida DP + HKS carbon Ti fit better on the wagon and made a whole heck of alot more power than the TXS turbo back. Goes on in about 1/2 the time too thanks to the better design. Nice idea on the TXS setup, but frankly it doesn't work in the real world.
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Old 07-19-2003, 08:38 PM   #8
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To each his own I guess. I got mine on in an hour using all factory hangers.

I would like to see real world numbers{dyno} with your setup though. A whole heck of a lot more power? Maybe on a wagon, not on the STi. Your exaggerations make me skeptical. Made in a driveway? You must be drinking early today.



Quote:
Originally posted by XT6Wagon
I've owned both at the same time. No contest in quality. The TXS one looks like it was made in someone's driveway... I know cause I used to make headers in mine. The Invida piece is very very well done. Also TXS loves to use crap bolts in european sizes so you can finaly get your 13mm and other random wrenches dirty. Gee thanks.

Power? All I know is that the Invida DP + HKS carbon Ti fit better on the wagon and made a whole heck of alot more power than the TXS turbo back. Goes on in about 1/2 the time too thanks to the better design. Nice idea on the TXS setup, but frankly it doesn't work in the real world.
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Old 07-19-2003, 09:08 PM   #9
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Likely with a little practice and a few new tools I could make 99% copies in a driveway. Anyhoo it was on a Stage IV wagon with FMIC. ATLEAST 10HP difference if not more. I think the Stock STi is right on the boarderline between them being even setups. After that the better flow path of the HKS catback, and the much smoother transitions and flanges of the Invida downpipe will show thier stuff.
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Old 07-19-2003, 09:29 PM   #10
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I have Turboxs DP ceramic coated and wrapped, also their cat and midpipe with prodrive muffler.

No one as yet has had a CEL using the Turboxs exhaust on the STI. I used to have their stage 4+ and got the CEL a few times.

XT6Wagon
As for "made in someones driveway". For a start each Turboxs exhaust turbo flange is faced off on a milling machine after the exhaust is welded up to ensure a correct fit. Must be one hell of a driveway you have. The bolts are also grade 5 not grade 2.
IMHO
There is one big reason to go with Turboxs and that is customer service. First class all the way.
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Old 07-19-2003, 10:55 PM   #11
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Only one person so far has mentioned Godspeed and noone has said anything about Cusco. I was also thinking Godspeed. Can you make one of those in your driveway? And if so how much do you want

offset
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Old 07-20-2003, 03:10 AM   #12
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Any of you guys(TurboXS, Invidia, Cusco..whatever else..) have baseline and post-modification dyno numbers? If most horsepower gains deems a downpipe as "best," then I'd really like to see these gains on a dyno graph. I know TurboXS gains something to the tune of +27 hp on the STi, but that really doesn't help someone who's shopping around when NO OTHER brands have been dynoed in comparison to it. I'm assuming numbers will soon be posted as more STi owners get opportunities to hit the dyno, both with stock runs and with modified runs. It's not really easy to guage someone's "I gained AT LEAST 'x' amount of horsepower with the 'x' downpipe" when no proof is shown in relation to other exhaust systems and as opinions tend to vary from person to person. Otherwise, it's really more a matter of personal preference as to what downpipe is the "best."

-STiLL
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Old 07-20-2003, 03:38 AM   #13
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i have Turboxs stealth back and got a cel with in 10 miles, Code po139 ..Still have it 2.

Kenny
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Old 07-20-2003, 04:00 AM   #14
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03, do you have the high flow cat or the racepipe?
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Old 07-20-2003, 03:03 PM   #15
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Quote:
Originally posted by 03UURX
i have Turboxs stealth back and got a cel with in 10 miles, Code po139 ..Still have it 2.

Kenny
PO420 is the CAT inefficency code.

PO139 is O2 sensor slow response(bank 1 sensor 2)

I think you either didn't join the connector back up properly or you broke a wire when lengthening the wires for the sensor.

IMHO
Nothing to do with Turboxs or any other DP.
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Old 08-11-2003, 06:03 PM   #16
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How about PDE downpipie? Whats your opinion on that compared to TurboXS or Invidia.
I'm thinking of getting a PDE downpipe and HKS Carbon-TI setup.
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Old 08-11-2003, 06:35 PM   #17
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so, everyone has got Invidia and TurboXS?

any particular reason why no one is using HKS?
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Old 08-21-2003, 03:53 PM   #18
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up
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Old 08-21-2003, 04:23 PM   #19
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godspeed.
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Old 08-21-2003, 04:32 PM   #20
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Quote:
Originally posted by OM3GA
so, everyone has got Invidia and TurboXS?

any particular reason why no one is using HKS?
Yes

1. No one seems to really know what it is made of

2. Its just a 3 inch pipe there is not belmouth or divorced waste gate design. It is the same design of the stock downpipe just a little wider and no cats.
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Old 08-21-2003, 06:53 PM   #21
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Invidia here. I had to modify it for a CEL fix and hack a bracket to get it to fit right. I also wrapped it with Thermo-tec exhaust wrap to keep temps down. The DP is really close to a vent hose coming out of the firewall.
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Old 08-21-2003, 09:18 PM   #22
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Quote:
Originally posted by dsmperformance
...I also wrapped it with Thermo-tec exhaust wrap to keep temps down...
Which brings me to another question. How many people wrap their downpipes with something? And does everyone use Thermo-tec?

TIA,
offset
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Old 08-21-2003, 10:40 PM   #23
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No mention of Perrin? The best design if you ask me, and they can be had for about 300$ shipped

http://www.perrinperformance.com/pro...e/downpipe.htm
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Old 08-21-2003, 11:14 PM   #24
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Quote:
Originally posted by offset


Which brings me to another question. How many people wrap their downpipes with something? And does everyone use Thermo-tec?

TIA,
offset
Good stuff and I highly recommend it on our cars due to the TMIC. Just be sure to seal the wrap with the high temp sealant.
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Old 08-22-2003, 12:01 AM   #25
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Newb question?

Can someone give a detailed explination of how a DP increases HP? (Physical)

ringaling
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