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Discussion Starter · #1 ·
Please advise; am looking for a quieter exhaust system for my 2013 S5 auto cabriolet to replace the original stock item. This has always droned but is slowly getting worse so looking at non-Audi replacement systems as don't want this annoyance again; in efficiency or comfort mode it sounds like a wheel bearing is giving up (though they / diff are fine).

Has anyone found a better alternative/combination of parts to the stock exhaust? I don't mind if any new system is not as free flowing etc as long as I can get rid of the drone. Or is the answer better sound proofing, and if so type/placement?

Thanks in advance.
 

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I would get your current exhaust checked as it sounds like it could be leaking. They are made of aluminiumised steel so last quite well in general. My guess is the infamous exhaust clamps that rust and split, leaving your exhaust leaking. If bad enough, it will give a deep sporty tone or sound like a drone!

There are 2 band clamps and they are situated under the centre arm rest. Only cost about £25 in parts and about 30 mins in labour.

Or a nother weak point is the downpipes can split on the flexis or worst case crack around the cat flange.

I would guess at these to fail points rather than the exhaust just sounding loud and droney!

Or you cann get an after martket exhaust as the stock exhaust is pretty expensive.

You will want a full resonated or silenced exhaust, not a track exhuast as this will still be loud. The aftermarket exhaust do tend to be performance orientated and with that comes a little more volume. It sounds like you don't like noisey exhausts, so you will have to do your research on them. Prices will start around £1500 for a fully silenced system.

Or you could go custom and have one made to your spec at places like Top Gear.

I made my own exhaust using science :) and calculated Helmholtz chambers which cancel drone, remote control flaps to control the volume and mine only has the back boxes as silencers and managed to get the volume down to around stock levels with the valves closed. :)
 
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Blimey Dave, that is some seriously sound help mate!!! I agree, the stock exhaust is in general very discreet and NOT noisy, the aftermarket ones tend to be louder cos they are more free flowing. My S4 is drone free and very discreet so I suspect you must have some leak or leaks mate.
 

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Discussion Starter · #4 ·
Thanks for your thoughts Dave - v useful and will ask my specialist to investigate accordingly.

Do you know if just the middle silencer can be replaced with an Audi part, or would I need someone to fabricate and fit a replacement? Audi seem to sell the 3 silencers and pipes in one lot judging by a price I was given previously - and rather more than your £1500 hence the thought about changing to something better; I've bought entire stainless systems for less!
Have had a look underneath as much as you can given lack of a ramp, and whilst the rear two boxes look OK the middle shows some surface rust so maybe internally the baffles are going, metal thinning out of sight etc. which might account for the drone (though no leakages recorded on MOT yesterday).
 

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You're welcome!
The standard exhaust consists of the manifold and cats upfront, then the downpipes to around the centre armrest, where it has 2 band clamps, then it is 1 piece all the way to the tail pipes. Hence, as you say, expensive as you are buying the bulk of the system.

Internally, it is aluminumised steel. I have cut open the back boxes of a 2009 S5 and they were in good order, nice and solid.

I have hanging on the wall of my garage a stock mid section with silencer, only done 39k miles! ;) If yours does need replacing and you made me an offer, I probably would sell as I very much doubt I will refit it now. I have a pair of back boxes too from my S5, but I'm wanting to keep hold of these for now, I think. :) But they have been cut off the system, so will need joining onto your system, but a lot lot cheaper than buying new, even with labour!

Ah, so if you had an MOT yesterday, then it must be sound externally!

There are 'systems' on Ebay, but generally sell for around £300! If you did want to go the route of buying mine in separate pieces, then just let me know, it will be cheaper.
 
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