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Thing with leaving mufflers alone is I know what's in them and I'm afraid it's creating some form of blockage therefore I wanted to get rid of it all.
The stock UrS exhaust system is good for many more hp than you are making now. Audi did a great job on that. Even the free-flowing Stromung 3" EM back system that we like in NAmerica doesn't really add any hp over stock, just maybe a bit quicker spooling (and a louder sound).
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
The ur RR 20v quattro 1989 -91 came fitted with cats. in uk they are not a legal requirement until 93 standard Bhp 220 a freind had his replaced with straight delete pipes then put car on rolling road .it made 244bhp
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I might just take cats out and see how it goes from there. 
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