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Old 02-06-2006, 12:11 PM   #1
subydude
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What's A Head Gasket?

Default STi Swap Exhaust Options

Hey All,

I'm putting a v8 STi (with twin scroll) engine into a 2000 2.5 rs and I'm trying to keep it as sleeper as possible. No loud exhaust or anything like that. I know the JDM downpipe is 3 inches shorter than the USDM one so I was basically looking for options.

Should I cut the twin scroll flange off and weld it on to a USDM length bellmouth downpipe into a USDM STi catback or should I just try to find the JDM STi cat back.

What do you all think about just using the STi catback to keep it quiet? I figured it was the best compromise between air flow and noise. If anyone else has a setup like this I'd appreciate any and all comments

On a side note, what's the max tire size I can run if I roll the fenders and have gc8 trailing arms with tein ss coilovers (I was shooting for 225's).

Thanks!!
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Old 02-06-2006, 12:33 PM   #2
subbyspeed
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You'll be fine running 225's and rolling your fenders.

Exhaust options.. Do you plan on retaining your cats?
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Old 02-06-2006, 12:37 PM   #3
subydude
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I was trying to keep one cat in place. I'd like to go with a high flow. The biggest issue is the town I live in has cops that will pull you over for having anything that would be much louder than stock. I was also thinking about talking to Rich at Daddy's to see if he might be able to weld the twinscroll flang on and then get the catted DP with custom 2.5 inch mid-pipe to stock STi axel back.....There's just to many things to think about!!!

Thanks for the info about the tires!
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Old 02-06-2006, 01:19 PM   #4
Jaxx
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welding a flange on is the best option...

225s .. depends on the rim i have had 215s rub with a +50 rim
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Old 02-06-2006, 01:48 PM   #5
subydude
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So should I go with less offset like 48 or should I go with more.

I'll look into getting that flange welded as well. Still open to any comments any one wants to make
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Old 02-06-2006, 02:53 PM   #6
Natoe
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i have a 3" DP and stock usdm sti catback, no cats, and it is still very quiet! nice sounding quiet. definetly a good choice
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Old 05-03-2006, 12:36 PM   #7
swappedGF
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I need help on this as well - JDM V7 drivetrain in a GF.

Getting a JDM exhaust will have different mounts - will it not?

And I thought the JDM downpipe was longer, not shorter...?
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Old 05-03-2006, 01:12 PM   #8
subydude
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JDM exhaust should still mount up.

The downpipe for the Ver7 has the same flange as USDM, but is 3 inches shorter. In this case I'd try to find a USDM downpipe so you don't have to worry about length or finding a JDM catback.

You can use a USDM wrx or sti catback without any problems as long as you don't mind missing the third hanger.
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Old 05-03-2006, 01:31 PM   #9
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I went with the stock STi exhaust and it is so stealthy. It should not be too difficult or expensive to have a shop fab up an extension.

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Old 05-03-2006, 03:47 PM   #10
Natoe
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what is everyone talking about 3" shorter or longer? i have a full exhaust for an sti on my car and it hangs except 2 hangars, which is fine. 02-06 exhausts fit my 95 impreza
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Old 05-03-2006, 04:22 PM   #11
swappedGF
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we're talking about the downpipe on the USDM vs JDM STi engines. They are a different length. Take a look at the Espelir exhaust...

http://forums.nasioc.com/forums/showthread.php?t=983629
Quoted from WorldOne review
"4. It comes with all this great stuff! A inner silencer and mounting hardware, a silencer removal tool so that you don't get your hands dirty, gaskets and install hardware, and JDM length extender so that this rare JDM catback bolts up to your USDM downpipe with zero problems."


But I thought it would be normal for the JDM downpipe to fit without the attachment - since it IS a JDM exhaust. I guess I just read it wrong.

-Edit: Didn't read it wrong, see quote ^^. Did WorldOne get it wrong?

Last edited by swappedGF; 05-03-2006 at 04:29 PM. Reason: added quote
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Old 05-03-2006, 04:25 PM   #12
subydude
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What's A Head Gasket?

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Quote:
Originally Posted by Natoe
what is everyone talking about 3" shorter or longer? i have a full exhaust for an sti on my car and it hangs except 2 hangars, which is fine. 02-06 exhausts fit my 95 impreza
We're talking about JDM Downpipes. They are shorter than the USDM pipes.

All USDM parts fit to all other USDM cars from 93 on plus or minus a few hangers.
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Old 05-03-2006, 04:44 PM   #13
Natoe
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weeeird... didnt realize that. is there something about JDM exhausts that flow better than USDM though? why go through that extra work?
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Old 05-03-2006, 04:47 PM   #14
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more cats



dam thats sexy
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Old 05-03-2006, 04:49 PM   #15
swappedGF
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nah - just the jdm tyte y0 fact0r!!@#!

But that Espelir comes with the extension so I could go between either USDM/JDM downpipes
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Old 05-03-2006, 04:51 PM   #16
swappedGF
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actually both JDM and USDM downpipes have cats. I think its the uppipe where this is not true. However, I have no idea on any current models, STi or WRX. I only cared about them when 02 was here and the initial WRX had a cat on the up pipe.

Now it's just GC err GF love. Sweet car Keshav... Can't wait to join the club.
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Old 05-03-2006, 05:00 PM   #17
Keshav
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Quote:
Originally Posted by Jaxx
dam thats sexy
thx. PIA in Tacoma did the swap. Great bunch of guys.


Ballz_Anthony you will not regret it one bit.
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Old 05-03-2006, 05:14 PM   #18
swappedGF
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Tacoma? Not familiar with the initials PIA either - where's this at/full name?

I'm getting mine done at DS1 Motorsports - west suburbs of Chicago. I've heard nothing but good words about them. But they don't have the fastest turn around either - which doesn't bother me at all as long as it's done well. Car goes in Monday

and ya - that's a dual ****ing dancin nanner
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Old 05-03-2006, 06:00 PM   #19
Keshav
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Quote:
Originally Posted by Ballz_Anthony
Tacoma? Not familiar with the initials PIA either - where's this at/full name?
PIA is Pacific Import Auto in Tacoma, WA. They are a Subaru specialist shop with a well-earned rep for quality work.


Last edited by Keshav; 05-03-2006 at 06:06 PM.
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Old 05-03-2006, 06:03 PM   #20
Jaxx
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in the DP the primary cat in a usdm wrx is larger than a jdm cat.. a usdm sti cat is even larger yet
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