S7 Resonator and "Suitcase" delete

**Esseven** · 04-29-2018 11:59 AM

Hey everyone, I recently had my local muffler shop cut off my front resonators and suitcase. WOW what a difference!

For someone considering this to "wake up" your S6/S7, there is no question. Cut those things out!

My end goal is to go with a full turbo back exhaust (Milltek or AWE) but wanted to try this first since it is a 10th of the price. This should keep me happy for another year when I can justify spending a couple thousand on an exhaust.

Let me know if you have any questions

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**Esseven** · 04-29-2018 12:34 PM

Quick sound video:

**RAF_S7** · 04-29-2018 01:32 PM

A few of us have done this, did you read up on it before doing it?

From your pictures, you have not inserted a crossover when you removed the centre suitcase.

This may cause you significant problems, and l recommend you put in an x-pipe crossover section in that centre section.

**Hofahome** · 04-29-2018 05:27 PM

Agree with above. I think it has to do with 4cyl mode though so maybe you could just have cod turned off via vcds.
Btw these cars reallllly wake up after you get rid of the stock mufflers. (I did X pipe in place of suitcase, then added oem sport mufflers bought from someone on here, then finally added the ams downpipes). I put videos up on youtube btw

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**elptxjc** · 04-29-2018 05:47 PM

Originally Posted by Hofahome

I think it has to do with 4cyl mode though so maybe you could just have cod turned off via vcds.

Can't disable COD via VCDS, FYI

. It'd be nice if that was true (I asked many times and only a tune can do that). I tried getting rid of COD by disabling T/C before and after turning engine on, using dynamic mode, and basically all other possible settings, and COD always comes on, even at exorbitant speeds, to my surprise. Oh well. By the way, will look for a shop to get rid of just the 'suitcase', so there's absolutely no more cabin noise on trips. Should be enough to raise the outside volume what I want

.

**Hofahome** · 04-29-2018 07:34 PM

Originally Posted by elptxjc

Can't disable COD via VCDS, FYI

. It'd be nice if that was true (I asked many times and only a tune can do that). I tried getting rid of COD by disabling T/C before and after turning engine on, using dynamic mode, and basically all other possible settings, and COD always comes on, even at exorbitant speeds, to my surprise. Oh well. By the way, will look for a shop to get rid of just the 'suitcase', so there's absolutely no more cabin noise on trips. Should be enough to raise the outside volume what I want

.

Ahhh ok my bad haha

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**Esseven** · 04-30-2018 05:54 AM

Originally Posted by RAF_S7

A few of us have done this, did you read up on it before doing it?

From your pictures, you have not inserted a crossover when you removed the centre suitcase.

This may cause you significant problems, and l recommend you put in an x-pipe crossover section in that centre section.

I did do some research before hand but didn’t read anywhere that it would cause problems.

What kind of significant problems would this cause? How would an x-pipe mitigate those problems?

I thought the x-pipe was purely for sound preferences

Thanks everyone for input!

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**07S6** · 04-30-2018 07:28 AM

Sounds good! i don't think you will have any problems going straight vs. x-pipe. Perhaps RAF_S7 was confusing this with the newer Sport Exhaust rear mufflers where the driver side exhaust valve is located at the pipe before the muffler. That's when you'd need some type of cross over in the middle for when that valve completely closes off that rear muffler. In your case, gases will always escape out of both mufflers, regardless of valve being open or closed.
Enjoy!

**RAF_S7** · 04-30-2018 09:18 AM

Originally Posted by Esseven

I did do some research before hand but didn’t read anywhere that it would cause problems.

What kind of significant problems would this cause? How would an x-pipe mitigate those problems?

I thought the x-pipe was purely for sound preferences
.

Thanks everyone for input!

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The suitcase that you deleted is actually a crossover chamber, and when COD (Cylinder on Demand) or certain Drive settings are active, the valves at the exhaust tips close. Without a crossover, and with the valves closed, you can cause too much back pressure, which, without a crossover, has no where to go and can cause problems with pressure build up. You may also get cabin drone.

There are two crossover options. An H-pipe, or an X-pipe. The x-pipe is more efficient, so most opt for that. There is quite a bit of debate in the forum, which you can find using the search feature

[Edit: just seen the above post, yes this may be for the C7.5 model - I have the facelift, so assumed the crossover was required....]

**AWOL** · 04-30-2018 12:52 PM

How much did that cost?

**Esseven** · 04-30-2018 01:23 PM

Originally Posted by 07S6

Sounds good! i don't think you will have any problems going straight vs. x-pipe. Perhaps RAF_S7 was confusing this with the newer Sport Exhaust rear mufflers where the driver side exhaust valve is located at the pipe before the muffler. That's when you'd need some type of cross over in the middle for when that valve completely closes off that rear muffler. In your case, gases will always escape out of both mufflers, regardless of valve being open or closed.
Enjoy!

Thanks for clearing that up!

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