I recently upgraded the standard 250W, 10-speaker soundsystem in my 2008 R36 Passat with the Dynaudio system taken from a 2010 R36 Wagon being wrecked for parts.
The install was simple (~6 hours, including Dynamat) and everything was plug and play for my car - YMMV
UPDATE: There may be different versions of wiring loom used in the R36. There's at least one account of the plugs not fitting 'Plug and Play'. Once the issue has been investigated and resolved, I will post details here of any differences.
Dynaudio Parts
Here's a photo of the package as it arrived:

The following are details of the Dynaudio parts (also listed here):
Amplifier - 3C0 035 346 J - Lear brand, 10-channel, 600W
Front Tweeters - 3C0 035 411 D (81310) - 6 Ω, approx ?2 inch, ??W
Front Bass+Mid - 3C0 035 454 B (85771/T85770) - 8Ω (both wired to 4 pin plug), Bass: approx 7 inch/??W, Mid: approx 3.25 inch/??W
Rear Tweeters - 3C0 035 411 E (81180) - 4Ω, approx ?1.5 inch, ??W
Rear Bass - 3C0 035 453 B (84899) - 8Ω, approx 5.75 inch, ??W
Note: I measured the speakers baskets (not cones), left/right part#'s are identical
(will post more specs as they become available) - if anyone can help with details like speaker ratings (??W), crossover frequencies (X-Y Hz) etc, that would be greatly appreciated (thanks).
Second hand parts can be sourced online via ebay (I found ebay.de the best - select 'Weltweit'/'Worldwide' search).
New parts can be sourced through an OEM parts distributor and can vary widely in price (eg. ~$700-1200 for the amplifier).
Also, JKU.com.au (Sunshine Coast Qld) told me they could source and fit the system. The price I was given for the parts was higher, though quite comparable to the price I ended up paying - would have saved me a lot of time. I can highly recommend the service/expertise at JKU from my experience with a 'bricked' RNS-510 unit.
Original Parts
The original system was actually quite good and turned out to be a Blaupunkt (quite respectable). Here are the part numbers that I replaced:
Amplifier - 3C0 035 346 K - ?? brand, 8-channel, 250W
Front Tweeters - 3C0 035 411 - 5 Ω, approx ?1.1 inch, ??W
Front Bass+Mid - 3C0 035 454 A - 2Ω (both wired to 4 pin plug), Bass: approx 7 inch/??W, Mid: approx 3.25 inch/??W
Rear Tweeters - 3C0 035 411 A - 5Ω, approx ?1.25 inch, ??W
Rear Bass - 3C0 035 453 - 4Ω, approx 5.75 inch, ??W - has capacitor soldered across wires (I assume to act as a frequency filter)
Tools, Dynamat etc
I highly recommend picking up a set of door trim tools (blue plastic tools in picture below) if you don't already have some. They will help prevent you from destroying your trim and breaking the Christmas tree clips.

I used prep-sol for cleaning up the door frames prior to installing the Dynamat Extreme and I also picked up a couple of DynaXorb deflector pads to see if/how well they work.
I went with a bulk pack of Dynamat Extreme (9 sheets, 3.3m2) as I plan to install a sub down the track. On this install, I only used 4 of the 9 sheets (1 per door). You can some money buying the Dynamat online - but I was doing the install that day, so I just picked some up from Autobarn (Capalaba store in Brisbane - stocks a range of Dynamat products/packs).

Installation Steps
The times below are approximate and based on my experience (and memory) - once again YMMV
Amplifier - 0.25-0.5 hr
Rear Doors - 1.5 hrs + 1 hr
Front Doors - 1.75 hrs + 1.25 hrs
(I'll link these steps up as I create them)
I started with amp (easiest and biggest improvement), then the rear doors (in case I screwed them up) and finally the front doors. Each time, the 2nd door took less time once I knew what I was doing.. (and wasn't taking photos
).
In general, the most difficult (strenuous) part of each door was removing the existing rivets and the most time-consuming was the Dynamatting.
Results (my subjective opinion only)
The Dynaudio system sounds great. Very clear highs/mids and the bass is tighter and more exact - the 1.5m2 of Dynamat Extreme and 2x DynaXorb deflectors I used would also helping in that department.
The amp made the biggest difference, though the standard speakers had trouble handling all the extra power. The Dynaudio speakers provide better sound, though it's more of an incremental improvement - not proportional to $$ spent. Personally, I would still upgrade both amp and speakers if I were to start again.
The 250W Blaupunkt system was still really good and I think it had a little more 'doof', but that is probably because the bass is less controlled (more muddy) and because the Dynaudio amp filters out some of the really low frequencies.
I plan to add a sub for extra 'doof' anyway - thinking of a (removable) custom fibreglass box that fills the spare wheel (keeping this) and spills out into the extra volume opposite the tire removal tookit. Then then have a 10" or 12" mounted within the enclosure under a false floor, covered in OEM carpet =)
Update (2014-05-07): after listening to the Dynaudio system for a few days, it continues to impress with the clarity and exactness. A few times I've been listening to a track and heard subtleties I never knew existed, or thought "w0w I didn't realize the beat did that". The upgrade was time & money well spent.
The install was simple (~6 hours, including Dynamat) and everything was plug and play for my car - YMMV
UPDATE: There may be different versions of wiring loom used in the R36. There's at least one account of the plugs not fitting 'Plug and Play'. Once the issue has been investigated and resolved, I will post details here of any differences.
Dynaudio Parts
Here's a photo of the package as it arrived:
The following are details of the Dynaudio parts (also listed here):
Amplifier - 3C0 035 346 J - Lear brand, 10-channel, 600W
Front Tweeters - 3C0 035 411 D (81310) - 6 Ω, approx ?2 inch, ??W
Front Bass+Mid - 3C0 035 454 B (85771/T85770) - 8Ω (both wired to 4 pin plug), Bass: approx 7 inch/??W, Mid: approx 3.25 inch/??W
Rear Tweeters - 3C0 035 411 E (81180) - 4Ω, approx ?1.5 inch, ??W
Rear Bass - 3C0 035 453 B (84899) - 8Ω, approx 5.75 inch, ??W
Note: I measured the speakers baskets (not cones), left/right part#'s are identical
(will post more specs as they become available) - if anyone can help with details like speaker ratings (??W), crossover frequencies (X-Y Hz) etc, that would be greatly appreciated (thanks).
Second hand parts can be sourced online via ebay (I found ebay.de the best - select 'Weltweit'/'Worldwide' search).
New parts can be sourced through an OEM parts distributor and can vary widely in price (eg. ~$700-1200 for the amplifier).
Also, JKU.com.au (Sunshine Coast Qld) told me they could source and fit the system. The price I was given for the parts was higher, though quite comparable to the price I ended up paying - would have saved me a lot of time. I can highly recommend the service/expertise at JKU from my experience with a 'bricked' RNS-510 unit.
Original Parts
The original system was actually quite good and turned out to be a Blaupunkt (quite respectable). Here are the part numbers that I replaced:
Amplifier - 3C0 035 346 K - ?? brand, 8-channel, 250W
Front Tweeters - 3C0 035 411 - 5 Ω, approx ?1.1 inch, ??W
Front Bass+Mid - 3C0 035 454 A - 2Ω (both wired to 4 pin plug), Bass: approx 7 inch/??W, Mid: approx 3.25 inch/??W
Rear Tweeters - 3C0 035 411 A - 5Ω, approx ?1.25 inch, ??W
Rear Bass - 3C0 035 453 - 4Ω, approx 5.75 inch, ??W - has capacitor soldered across wires (I assume to act as a frequency filter)
Tools, Dynamat etc
I highly recommend picking up a set of door trim tools (blue plastic tools in picture below) if you don't already have some. They will help prevent you from destroying your trim and breaking the Christmas tree clips.
I used prep-sol for cleaning up the door frames prior to installing the Dynamat Extreme and I also picked up a couple of DynaXorb deflector pads to see if/how well they work.
I went with a bulk pack of Dynamat Extreme (9 sheets, 3.3m2) as I plan to install a sub down the track. On this install, I only used 4 of the 9 sheets (1 per door). You can some money buying the Dynamat online - but I was doing the install that day, so I just picked some up from Autobarn (Capalaba store in Brisbane - stocks a range of Dynamat products/packs).
Installation Steps
The times below are approximate and based on my experience (and memory) - once again YMMV
Amplifier - 0.25-0.5 hr
Rear Doors - 1.5 hrs + 1 hr
Front Doors - 1.75 hrs + 1.25 hrs
(I'll link these steps up as I create them)
I started with amp (easiest and biggest improvement), then the rear doors (in case I screwed them up) and finally the front doors. Each time, the 2nd door took less time once I knew what I was doing.. (and wasn't taking photos

In general, the most difficult (strenuous) part of each door was removing the existing rivets and the most time-consuming was the Dynamatting.
Results (my subjective opinion only)
The Dynaudio system sounds great. Very clear highs/mids and the bass is tighter and more exact - the 1.5m2 of Dynamat Extreme and 2x DynaXorb deflectors I used would also helping in that department.
The amp made the biggest difference, though the standard speakers had trouble handling all the extra power. The Dynaudio speakers provide better sound, though it's more of an incremental improvement - not proportional to $$ spent. Personally, I would still upgrade both amp and speakers if I were to start again.
The 250W Blaupunkt system was still really good and I think it had a little more 'doof', but that is probably because the bass is less controlled (more muddy) and because the Dynaudio amp filters out some of the really low frequencies.
I plan to add a sub for extra 'doof' anyway - thinking of a (removable) custom fibreglass box that fills the spare wheel (keeping this) and spills out into the extra volume opposite the tire removal tookit. Then then have a 10" or 12" mounted within the enclosure under a false floor, covered in OEM carpet =)
Update (2014-05-07): after listening to the Dynaudio system for a few days, it continues to impress with the clarity and exactness. A few times I've been listening to a track and heard subtleties I never knew existed, or thought "w0w I didn't realize the beat did that". The upgrade was time & money well spent.
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