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View Full Version : help on 2001 vw if anybody knows



vwjetta69
03-10-2006, 12:40 AM
I have a 2001 vw jetta with a 1.8t and I want to put a downpipe that elemanates the catalic converter. Will this set my check engine light off so I dont pass emisions for an inspection sicker.

Chevyaudio
03-10-2006, 12:41 AM
If you take the cat off of any car, it wont pass an emmisions test.

vwjetta69
03-10-2006, 12:44 AM
thers nothing i can do to make it pass so I have to get a downpipe with a cat.

Chevyaudio
03-10-2006, 12:45 AM
Pretty much...unless your live in Louisiana (like me) where we dont have emissions tests. he he

vwjetta69
03-10-2006, 12:50 AM
damit I hate ny there a bunch of j**s do u have any recommendations as far as a brand for downpipes, I want a 3inch al the way.

Lunchbocks
03-10-2006, 02:15 AM
i'll tell you what ya do, take the shell of a cat and weld it on the outside of the downpipe so it passes visual inspection

then, lookin into either an o2 simulator or, use a bung thats got a lot of depth for the after cat o2, so that way it reads on the lean side which is what the after cat is supposed to, simulator preferred but taking it out of direct exhaust stream can be the easy way to make it work usually.

good luck buddy, the shell of the convertor works trust me, i've gotten the mirror test before on my old talon, never had a problem.

dbhittin
03-10-2006, 10:57 AM
what im doin is going to get my car smoged next week, then put on my 3" down pipe without cat.... oh yea, 1.8t are pretty slow unless u hella mod them

Qoob
03-11-2006, 01:27 AM
1.8t's pickup horsepower real quick with the simplest modifications actually...
First on my list would be software upgrade.. GIAC.
Intake and exhaust, then downpipe (with cat).

Yes your check engine light will come on with no cat, however you can always fool the computer with a dummy post-cat o2 putting out a stabalized voltage. Not sure if thats the road you want to go though, especially if that car is your daily driver.

KnOkIn It 420
03-11-2006, 02:22 AM
Pretty much...unless your live in Louisiana (like me) where we dont have emissions tests. he he

Me too ha ha



i'll tell you what ya do, take the shell of a cat and weld it on the outside of the downpipe so it passes visual inspection

then, lookin into either an o2 simulator or, use a bung thats got a lot of depth for the after cat o2, so that way it reads on the lean side which is what the after cat is supposed to, simulator preferred but taking it out of direct exhaust stream can be the easy way to make it work usually.

good luck buddy, the shell of the convertor works trust me, i've gotten the mirror test before on my old talon, never had a problem.

It works follow his instructions

dubbinjet
03-11-2006, 08:29 AM
you can invest in a full 3" exhaust downpipe and cat back. GHL is a good brand. or you can look into an ebay DP, they are cheap, and from what i hear works pretty well. i have a full 2.5" milltek exhaust and a 2.5" milltek DP for my 1.8T. invest in a computer chip, they are sweet.

dbhittin
03-11-2006, 05:51 PM
any turbo car is gonna see big gains from little things

Silver
03-11-2006, 06:23 PM
man so glad we don't have emission tests anymore!!!

id fail.. :)

Qoob
03-11-2006, 07:57 PM
Just completed this one recently in the shop (customer car). A fast car car off the showroom floor, now it's a beast! This ride has just about everthing except internal work and gearing.

http://i44.photobucket.com/albums/f31/roadmasters/Picture_185.jpg

http://i44.photobucket.com/albums/f31/roadmasters/Picture_189.jpg

dubbinjet
03-12-2006, 11:08 AM
ahhh Supercharged vr6 is sweet!

btw...you could always just get a 3 inch pipe with a cat, it will still flow mighty well, along with the catback. or, if you are up for it, get your test pipe, and switch it everytime 2 years when you have to take it in for inspection. that would ****, but you could if you wanted to.

Diehonda
03-27-2006, 11:30 PM
You can also bypass the CEL check with a sparkplug nonfouler. Get one from Autozone and drillt he center of one out with a 1/2 inch bit. The put that in the second O2 bung and screw the O2 into it. No CEL. It is far enough from the gases to not pull the full temp reading. I have one on my Mazda. Had one on my Jetta when I had it. The simulator is Ok but requires wiring know how where the nonfouler is idiot proof.

heyman421
03-29-2006, 08:43 AM
If you've got any welding skills, just weld a normal exhaust resonator where the cat used to be, visual inpection... check!

Then find someone with a vagcom and adapt and clear the o2 sensor code when the car's running full temp. This'll clear the code for a good hour or so.

Most states don't even do measured tests on obd2 cars, so this will pass you, atleast.