Length of pipe after cat?

1975 Kombi

Veteran Member
Joined
Jun 3, 2014
Location
Acton, Ontario, Canada
TDI
2003 TDI Jetta, 2011 Touareg TDI, 1992 D Jetta, 1992 TD Jetta, 2001 NB TDI, 1992 Golf coupe D
Car is in the shop but I want to locate a section of pipe to replace the section after the cat.

18"? Not sure on the length. I guess I could weld on 20" and cut to fit after but would like to at least the size to find a section in the scrapyard.
 
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JETaah

Vendor , w/Business number
Joined
Jan 18, 2001
Location
mi 48836
TDI
96 B4V, 1999.5 jettaIV,2005 BEW Beetle
If you are butting it up to the rear pipe, the post cat pipe length of a stock down pipe is 14.25". That leaves a little clearance between the pipes. A dual clamp bridges the gap.
 

1975 Kombi

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Joined
Jun 3, 2014
Location
Acton, Ontario, Canada
TDI
2003 TDI Jetta, 2011 Touareg TDI, 1992 D Jetta, 1992 TD Jetta, 2001 NB TDI, 1992 Golf coupe D
Super. I'm not sure if I should remove the little bit of pipe inside the CAT or just but it and weld.
 

Mongler98

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Mar 23, 2011
Location
Northern MD (HAGERBUSH)
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98 Jetta TDI AHU 1.9L (944 TDI swap in progress)
If you can weld. Just go to mandrel bending solutions and make up a new exhaust. Costs about $50 in new pipe maybe less. I did my entire 3" strait back for $85 in parts with v bands included.
 

JETaah

Vendor , w/Business number
Joined
Jan 18, 2001
Location
mi 48836
TDI
96 B4V, 1999.5 jettaIV,2005 BEW Beetle
Super. I'm not sure if I should remove the little bit of pipe inside the CAT or just but it and weld.

I always just butt weld the pipe to the cat ...never lost one (that I know of) Probably done a couple dozen that way over the years.
 

1975 Kombi

Veteran Member
Joined
Jun 3, 2014
Location
Acton, Ontario, Canada
TDI
2003 TDI Jetta, 2011 Touareg TDI, 1992 D Jetta, 1992 TD Jetta, 2001 NB TDI, 1992 Golf coupe D
And if my measurements are correct I believe it to be 55mm O.D. X 14.25" lol My local shop fixed my 2003 with a smaller diameter piece of pipe and just flared the ends to fit inside the original pipes. Since it is a metric size and not available in North America they fit this smaller pipe in and welded. I wish to locate a 55mm pipe off another VW vehicle at the scrapper and weld it on. Apparently it is a common problem.
 
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flee

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Sep 19, 2011
Location
Chatsworth, CA
TDI
2002 Jetta GLS wagon
And if my measurements are correct I believe it to be 55mm O.D. X 14.25" lol My local shop fixed my 2003 with a smaller diameter piece of pipe and just flared the ends to fit inside the original pipes. Since it is a metric size and not available in North America they fit this smaller pipe in and welded. I wish to locate a 55mm pipe off another VW vehicle at the scrapper and weld it on. Apparently it is a common problem.
It's close to 2 1/4" which is a common size. Just use that.
 

JETaah

Vendor , w/Business number
Joined
Jan 18, 2001
Location
mi 48836
TDI
96 B4V, 1999.5 jettaIV,2005 BEW Beetle
Between the cat and the part that gets clamped is usually a usable section of OEM pipe that you can use to adapt to the rear exhaust pipe/clamp. I graft this piece, be it 4-5 inches long, to a section of 2 1/4 dia pipe to make the 14 1/4 inch long section and weld that to the cat.

I think it is real handy to have a break in the exhaust where the down pipe can be separated from the rest.
 
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