cat bypass on urs4

[Phil Payne]

> Just wondering what the collective has to say on this type of mod, i am 
able to my hands on a pair of cats for my urs4 and i fancy knocking out the 
guts of the cat and installing a through pipe in both.

Beware of Audi's pricing strategies - an "exchange" cat is one HELL of a 
loty cheaper that a straight purchase unit.  Whatever you do, always retain 
a couple of exchangeable units.