JDM Spec and USDM spec piping

Syms-STI · 09-07-2005, 08:36 PM

so what is the different?

I had an Zerosports JDM spec CBE and i compared to my STI oem CBE and they have no difference in lenght... so I dont get it...

is it the difference is in the downpipe section?

please help me to understand it.

thanks

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SubasaurusWrex · 09-07-2005, 08:51 PM

yes, the dp IS different on jdm cars, its longer by about 10+ inches.

ImprezaRSfan! · 09-07-2005, 10:19 PM

jdm downpipe is shorter, usdm longer, becuase usdm cars have the 3rd cat and jdm cars dont

Subi114 · 09-08-2005, 12:49 AM

^^^ what he said I have a jdm tbe on my car and the dp is shorter by about 5-7in. and if you notice most exhaust coming from jp taper to 2 and a quarter to fit the stock donut gasket.

Carbon888 · 09-08-2005, 05:47 AM

yes. If you buy a JDM exhaust, you need a JDM dp to fit on your car.
Kakimoto with Cusco Dp or RS-R Dp etc...

SubasaurusWrex · 09-08-2005, 11:46 AM

you guys must be on crack or something my dp i WAY longer than USDM (RS*R)

dan avoN7 · 09-08-2005, 02:47 PM

that is because you have the RSR downpipe designed to work with their turboback exhaust. Look at other JDM downpipes and you will see they are alot shorter.

Syms-STI · 09-08-2005, 05:05 PM

interesting, i have zerosports cat back and it will fit on the cat from the dp. so.... i am guessing using a JDM DP will take out the cat in between the exhaust and dp. if using USDM spec dp will still need the cat in between them...

this is just my guess...

WRX8XB · 09-08-2005, 06:22 PM

Ok,

The JDM Downpipe is one piece.

The USDM Downpipe is two piece, and includes a third cat.

If you look at the USDM Downpipes Rear 02 sensor that is where the JDM Downpipe stops (just after).

Sure the flanges will match to a USDM Downpipe b/c they are the same diameter pipe but the length isn't correct.

Since the USDM downpipe is two pieces you could take the 3rd cat pipe out and get some custom pipe bent to go from USDM shorty to JDM Catback.

CF: JDM Catback use JDM Downpipe
USDM Catback use USDM Downpipe simple as that.

Syms-STI · 09-08-2005, 07:02 PM

so confuse now... any pictures to show the differences?

WRX8XB · 09-08-2005, 07:04 PM

I'll look for some later.

Do a search for JDM vs USDM downpipe

Syms-STI · 09-08-2005, 07:11 PM

http://forums.nasioc.com/forums/showthread.php?t=842009

borrowing from the thread above.

JDM will cover both cat and still have a 3rd cat?

if that is the case, our cars have so many cat.....

thanks for the help

dropmech · 09-09-2005, 08:13 AM

looking at this picture, It shows a USDM aftermarket downpipe.

http://forums.nasioc.com/forums/show...62&postcount=3

the JDM Downpipe would stop right after the 02 sensor bung, and be one piece

The JDM Downpipe has one Cat right after the turbo.

Carbon888 · 09-09-2005, 03:25 PM

so the RS*R downpipe won't fit with the kakimoto exhaust?

09-07-2005, 08:36 PM	#1
Syms-STI Scooby Specialist Member#: 87463 Join Date: May 2005 Location: Redmond Vehicle: 2004 STI AspenWhite	JDM Spec and USDM spec piping so what is the different? I had an Zerosports JDM spec CBE and i compared to my STI oem CBE and they have no difference in lenght... so I dont get it... is it the difference is in the downpipe section? please help me to understand it. thanks * Registered users of the site do not see these ads.

09-08-2005, 11:46 AM	#6
SubasaurusWrex Scooby Specialist Member#: 70285 Join Date: Sep 2004 Location: Schaumburg, IL Vehicle: 2011 JCW Mini Midnight Black/Red roof	crackheads.. you guys must be on crack or something my dp i WAY longer than USDM (RS*R)

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09-07-2005, 08:51 PM	#2
SubasaurusWrex Scooby Specialist Member#: 70285 Join Date: Sep 2004 Location: Schaumburg, IL Vehicle: 2011 JCW Mini Midnight Black/Red roof	yes, the dp IS different on jdm cars, its longer by about 10+ inches.

09-07-2005, 10:19 PM	#3
ImprezaRSfan! Scooby Specialist Member#: 13520 Join Date: Dec 2001 Chapter/Region: MAIC Location: Springfield, VA Vehicle: 99rs ej207 spec-c its for sale	jdm downpipe is shorter, usdm longer, becuase usdm cars have the 3rd cat and jdm cars dont

09-08-2005, 12:49 AM	#4
Subi114 Scooby Specialist Member#: 48401 Join Date: Nov 2003 Chapter/Region: SCIC Location: I'm back!!!! Vehicle: 05 sti 08 cbr600RR	^^^ what he said I have a jdm tbe on my car and the dp is shorter by about 5-7in. and if you notice most exhaust coming from jp taper to 2 and a quarter to fit the stock donut gasket.

09-08-2005, 05:47 AM	#5
Carbon888 Scooby Specialist Member#: 65536 Join Date: Jul 2004 Vehicle: 05 Impreza \| STi Simple.less is more.	yes. If you buy a JDM exhaust, you need a JDM dp to fit on your car. Kakimoto with Cusco Dp or RS-R Dp etc...

09-08-2005, 02:47 PM	#7
dan avoN7 Top Scoob 002 Member#: 32771 Join Date: Feb 2003 Chapter/Region: BAIC Location: Danville, CA Vehicle: 03 Black WRX 04 White M3	that is because you have the RSR downpipe designed to work with their turboback exhaust. Look at other JDM downpipes and you will see they are alot shorter.

09-08-2005, 05:05 PM	#8
Syms-STI Scooby Specialist Member#: 87463 Join Date: May 2005 Location: Redmond Vehicle: 2004 STI AspenWhite	interesting, i have zerosports cat back and it will fit on the cat from the dp. so.... i am guessing using a JDM DP will take out the cat in between the exhaust and dp. if using USDM spec dp will still need the cat in between them... this is just my guess...

09-08-2005, 06:22 PM	#9
WRX8XB NASIOC Supporter Member#: 45323 Join Date: Oct 2003 Chapter/Region: South East Location: Orlando Vehicle: MY05 Impreza WRX STi Pastelito Racing & SFSOC	Ok, The JDM Downpipe is one piece. The USDM Downpipe is two piece, and includes a third cat. If you look at the USDM Downpipes Rear 02 sensor that is where the JDM Downpipe stops (just after). Sure the flanges will match to a USDM Downpipe b/c they are the same diameter pipe but the length isn't correct. Since the USDM downpipe is two pieces you could take the 3rd cat pipe out and get some custom pipe bent to go from USDM shorty to JDM Catback. CF: JDM Catback use JDM Downpipe USDM Catback use USDM Downpipe simple as that.

09-08-2005, 07:02 PM	#10
Syms-STI Scooby Specialist Member#: 87463 Join Date: May 2005 Location: Redmond Vehicle: 2004 STI AspenWhite	so confuse now... any pictures to show the differences?

09-08-2005, 07:04 PM	#11
WRX8XB NASIOC Supporter Member#: 45323 Join Date: Oct 2003 Chapter/Region: South East Location: Orlando Vehicle: MY05 Impreza WRX STi Pastelito Racing & SFSOC	I'll look for some later. Do a search for JDM vs USDM downpipe

09-08-2005, 07:11 PM	#12
Syms-STI Scooby Specialist Member#: 87463 Join Date: May 2005 Location: Redmond Vehicle: 2004 STI AspenWhite	http://forums.nasioc.com/forums/showthread.php?t=842009 borrowing from the thread above. JDM will cover both cat and still have a 3rd cat? if that is the case, our cars have so many cat..... thanks for the help

09-09-2005, 08:13 AM	#13
dropmech Scooby Specialist Member#: 41477 Join Date: Aug 2003 Chapter/Region: NESIC Location: Cape Cod, MA. Vehicle: 2006 Tahoe that will pull your bumper off	looking at this picture, It shows a USDM aftermarket downpipe. http://forums.nasioc.com/forums/show...62&postcount=3 the JDM Downpipe would stop right after the 02 sensor bung, and be one piece The JDM Downpipe has one Cat right after the turbo.

09-09-2005, 03:25 PM	#14
Carbon888 Scooby Specialist Member#: 65536 Join Date: Jul 2004 Vehicle: 05 Impreza \| STi Simple.less is more.	so the RS*R downpipe won't fit with the kakimoto exhaust?