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find the cause - test , do not guess
..."I'd also be interested in hearing your thoughts on this, I realize that this will likely bring down efficiency overall because of the extra restriction. One way I was hoping to combat this was with a good High-efficency High-cell count Metal core unit as at least the primary, and perhaps as the secondary as well. I'm sure the comparison of these to OE cats as far as emission reduction is debatable, but I have used Pace-setter metalcores in the Audi and passed emissions with them, so they are passable at least.
Ok, thanks for reading, Lets see what the ideas would be. (note, the diesel is not required to pass emissions, but she wants less soot out the tail-pipe, so to speak. A diesel injection pump upgrade is on the table as well)
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if a VW TDi has a lot of "soot" visible in the exhaust
there is a problem in the system
locate and repair the problem
do not think that by self engineering a "cat" to the car , you are going to improve something or solve anything .
have a look in VWvortex forum
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