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View Full Version : Cat converters for a 2.5l petrol T4?


Cometboy
19-10-2016, 09:37 AM
Anyone out there that has played with aftermarket cat converters for a 2.5l petrol T4 (2002)?

I have a real “tinnie buzzy” sound under acceleration that does largely go away once the transporter is up to temperature. Not bad at idle when cold. Certainly seems to be coming from inside the cat itself and have checked all the normal heat shield issues etc. But having said all this the brick doesn’t seem to be loose inside the cat when tapped?? Any other areas to look at that could cause this symptom?

For a replacement, I would like to source the quietist aftermarket I can find. I have tried a high flow sports cat on another T4 and it was very raspy and hopeless. I guess you get what you pay for…. The OEM VW cat was around $1600 the last time I checked!

Any recommendations appreciated.
Thanks
Sunny43.5
20-10-2016, 03:34 PM
Find an exhaust shop remove the cat and belt an iron bar through the centre stops all problems , made my van run faster better acceleration and better economy . PS you didn't hear that from me |.:emo_baghead:
Umai Naa!!
20-10-2016, 04:10 PM
That's providing the workshop is happy to pay a $100,000 fine to the EPA.
Sunny43.5
20-10-2016, 06:47 PM
I am going to invoke the first amendment on that one , cannot remember where the van went .Oh that's right they shut down and the owners moved to Outer Mongolia .:wasntme:
Cometboy
20-10-2016, 09:37 PM
When I first looked at the issue I did think of a dummy cat solution but decided against it for two reasons.

1 - Donating $10,000 to the EPA (maybe the fine has increased to $100,000 now??)

2- I also have been told the back pressure the cat provided was important (can't remember the exact story... maybe BS?)

German Auto Service here in Adelaide (seem good from previous experience with them) have recommended Carline and say they have installed many cats on T4 with no problems. I have contacted them and they do seem very familiar with the T4 so might give them a try once we are back in Adelaide.
Umai Naa!!
20-10-2016, 10:09 PM
The fine for a workshop caught doing it, is significantly higher than for an individual.