S6 Exhaust options

[talleyrand]

Well while at the mechanic my s6 had the cats cut off..... Mechanic has insurance apparently but I'm going to try and suggest buying an aftermarket exhaust rather than replacing the cats with OE as I doubt they are available anyways. Seems online options are very limited or nonexistant, but JHM does seem to offer an exhaust for the 4.2l v8 allroad. Can anyone confirm that this would fit or have any suggestions? I sent an email to milltek about their offerings.

[NWS6]

MagnaFlow has some options.

https://www.magnaflow.com/collection...tic-converters

[talleyrand]

Quite pricey for the direct fit ones.. I think I'd rather take the insurance money to a reputable exhaust shop at that point

[Jawsman2]

I put vibrant bottle resonators in place of my cats, works great. Cheap too.

[talleyrand]

I put vibrant bottle resonators in place of my cats, works great. Cheap too.

Not a bad idea at all, happen to have a video of it?

[Jawsman2]

Not a bad idea at all, happen to have a video of it?

https://www.youtube.com/watch?v=IH_GCkoVh94 This has the milltek resonated exhaust too.

[talleyrand]

https://www.youtube.com/watch?v=IH_GCkoVh94 This has the milltek resonated exhaust too.

Thanks, sounds pretty good but not overly loud.

Also I got an email back from Milltek and the C5 S6 exhaust is indeed no longer produced and they don't have any left )=

[Jawsman2]

Thanks, sounds pretty good but not overly loud.

Also I got an email back from Milltek and the C5 S6 exhaust is indeed no longer produced and they don't have any left )=

Yeah the S6 specific exhausts are hard to come by, thankfully I scored this one from a vendor and since I had the Rs6 body conversion, it fit right up. It's a very tuned sound. But prior to that, I had an APR exhaust that the previous owner modified to fit. It was for an allroad originally I think. The cat delete with the resonators is very tame. My cats were rattling so it was time for them to go regardless. My one mistake was not selling them and instead gutting them, which sounded awful.

[superdlux]

I put vibrant bottle resonators in place of my cats, works great. Cheap too.

Link to resonators your used?


Sent from my iPhone using Audizine

[Jawsman2]

Link to resonators your used?


Sent from my iPhone using Audizine

https://www.summitracing.com/parts/VPE-1790

[surferdude]

I’m in CA and had to replace one of my CCs after it burned out. Magnaflow has options for under $300 (if you need CARB certification), and less $ if you don’t need the CARB stamp. As others have noted, JHM has some options, including long tube headers. Their setup sounds badass too…


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[surferdude]

https://youtu.be/WPy1aW7n-Kg


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[C5S6]

If you can find one, a stock RS6 system sounds great - even non-SE. I've had one going on 13 years now. Plenty of great blurble & overrun popping noises which were enhanced when I reworked the stock downpipe/cat combo. Not as awesome as the JHM longtube video above, but for sure wife, kid, & long distance tolerable. They are all stainless, so they hold up well...but my dry climate also helps with slowing corrosion of things. Sorry, no video, as the few attempts I've made don't come close to what it actually sounds like. I took the more difficult path of sectioning the tips to fit the S6 bumper so I didn't have to cut it.

Last time it was out for my 01E swap I welded in 2.5" v-bands to replace the slip joints. I also reworked the stock down pipes to eliminate the big automatic transmission dents, repositioned the spring hangers by the trans mounts, and cut the inlet/outlets of the stock cats to accomodate 2-1/2" pipe. It was about $200 (2020 dollars) for v-bands, flex joints, and 2-1/2" tubing + my time on the welder to "upgrade" the stock downpipes.
From Summit Racing -
x2 Flex joints PSM-82-4216
x2 V-bands HOK-41171HKR
x1 Tubing STW-MBJ250

I can't comment factually on the JHM allroad 4.2 system, but given that C5 chassis are dimensionally the same, it should fit with little modification.

Naked modified RS6 tip, stock S6 bumper


Finished


& the downpipe/cat/exhaust junction

[Badcopnodonut]

I went with the milltek rs6 non resonated exhaust.
Did not installed it yet though
bumper modification needed for the oval tips
https://www.eurosporttuning.com/euro...oon-avant.html

[taddraughn]

The magnaflow you linked on the JHM site should fit without modification. I modified mine to have v bands, but it wasn't necessary. The exhaust necks down to 2" pipe just like the stock catback so you should be able to use the same stock exhaust clamps

[talleyrand]

Yeah the S6 specific exhausts are hard to come by, thankfully I scored this one from a vendor and since I had the Rs6 body conversion, it fit right up. It's a very tuned sound. But prior to that, I had an APR exhaust that the previous owner modified to fit. It was for an allroad originally I think. The cat delete with the resonators is very tame. My cats were rattling so it was time for them to go regardless. My one mistake was not selling them and instead gutting them, which sounded awful.

How loud is the exhaust in the car with just the resonators? Not wanting it to get annoying on longer trips.

The magnaflow you linked on the JHM site should fit without modification. I modified mine to have v bands, but it wasn't necessary. The exhaust necks down to 2" pipe just like the stock catback so you should be able to use the same stock exhaust clamps

Good to know! The stock exhaust after the slip couplers wasn't damaged so I won't be worrying about it for now but it is a future possibility.

[Jawsman2]

My drone is very minimal. I can hear the exhaust, but it doesn't rattle the car whatsoever. It's the perfect tone inside and outside it's loud if I step on it, and a nice rumble when I'm cruising.

[Badcopnodonut]

Finally did it

https://youtu.be/c89MzhgoiYk

[Jawsman2]

Finally did it

https://youtu.be/c89MzhgoiYk

Nice work. Sounds just like mine except with rasp.

[mercurial_c5s6]

I see this thread is a bit dusty, but this is about the most relevant I've come across on the forum and would greatly appreciate some sage feedback from awesome members here.

Anyone have experience or recommendations for aftermarket cats? I'm sizing up the Magnaflow options (universal vs. full downpipe) but curious to see if anyone has experience with either or other aftermarket options.

Some additional context:
Recently added the resonated rs6 milltek catback to my s6 avant. I was planning to keep my original downpipes and cats, but upon cutting the flex joint to replace it (was a bit bunged up) it became clear the cat on that side was totally finished. I decided to do a cat delete temporarily while figuring out options and it both sounds amazing and way to aggressive (think setting off car alarms and being scared to go over 1000rpm around cops).