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Old 09-07-2005, 08:36 PM   #1
Syms-STI
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Default 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
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Old 09-07-2005, 08:51 PM   #2
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yes, the dp IS different on jdm cars, its longer by about 10+ inches.
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Old 09-07-2005, 10:19 PM   #3
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jdm downpipe is shorter, usdm longer, becuase usdm cars have the 3rd cat and jdm cars dont
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Old 09-08-2005, 12:49 AM   #4
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^^^ 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.
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Old 09-08-2005, 05:47 AM   #5
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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...
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Old 09-08-2005, 11:46 AM   #6
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Default crackheads..

you guys must be on crack or something my dp i WAY longer than USDM (RS*R)
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Old 09-08-2005, 02:47 PM   #7
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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.
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Old 09-08-2005, 05:05 PM   #8
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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...
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Old 09-08-2005, 06:22 PM   #9
WRX8XB
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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.
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Old 09-08-2005, 07:02 PM   #10
Syms-STI
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so confuse now... any pictures to show the differences?
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Old 09-08-2005, 07:04 PM   #11
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I'll look for some later.

Do a search for JDM vs USDM downpipe
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Old 09-08-2005, 07:11 PM   #12
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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
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Old 09-09-2005, 08:13 AM   #13
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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.
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Old 09-09-2005, 03:25 PM   #14
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so the RS*R downpipe won't fit with the kakimoto exhaust?
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