The Car: 2001 A6 Quattro V8 (85k miles)

The Problem: Bad Cat

I think the car has 4 cats and replacing just one of the 4 cats in this car doesn't make much sense to me when a new cat back system can be had for $2k or a little less. I've exhausted search on the site trying to find info on aftermarket exhaust systems for this car. I found the following:

1. Milltek: Decent sounding setup (no too loud) but I've heard about fitment issues and rattling. System costs: $1500

2. Eisenamnn: Haven't heard the setup. Read one review that said these were nice-nice. They ought to be for $2000+

3. I've heard there's an AWE solution, but haven't heard much more about it.

Questions:
Can anyone go into detail about any of the above systems and/or any that I'm missing?

If I were to go with a VAST ECU/TCU upgrade what exhaust would be best, or does VAST roll their own?

Has anyone with the VAST ECU/TCU upgrade run into any reliability issues?

Thanks to the guys at VAST for pwning the 4.2 and thanks to you guys on these forums. I've been able to fix a lot of little issues with this car on my own with all of your help. Thanks to the VAG-Com guys too, really useful product.

Brian

 

Cargraphic makes exhaust and it sounds mean. There is a s6 on you tube and it is amazing. They have either round tips or quads that look like the "rings". Here is the website. http://www.cargraphic.de/index.php?/s,6,7,19,149,795/ I hope this helps, Matt.