I have personally tried the following on my 3.0 24V 2001.
-a travesty of the modern automotive age
2. Centre muffler replaced by straight through pipe (raggazon). End mufflers original.
-Sound is not much different
-0-3000 rpm slightly more bass. Sad part is, above 3000 rpm the sound becomes the same as original. I.e. you don't hear the exhaust anymore. Sounds very weak.
3. Centre muffler original, end straight through pipe (raggazon)
-Sound is boosted somewhat. You get a hint of overrun crackle but it is sadly very muted/very bassy. High rpm sounds better, like a mini ferrari. Same type of sound, but very much reduced volume and range. On the whole not all that different to the original sound.
4. Centre muffler ragazzon "small" (from shop.alfisti.net), end straight through pipe (ragazzon).
-Louder than above. This is where you start to hear the car above other cars in traffic. But it is not overly obnoxious. If you drive with relative moderate revving it will not turn heads. The overrun crackle is much more pronounced than above. But it is still a dark sound. The crackle therefore is not crystal clear. Not deep like a Subaru sound but it seems to suit the car well. Higher in rev range, especially on roads with tall buildings either side, it will turn heads. But it is not a chavvy (extreme) sound, and there is no droning around idle. The sound is remarkably like the 8C, but with noticably reduced decibels and range. Startup / idle sound is nice, loud, but not boomy.
5. Centre muffler homemade "Simons" exhaust (Called Jetex in UK & US) (on ragazzon straight through pipe), end straight through Ragazzon.
-Very deep sound. Like subaru. Almost no definition at all. Very muted overrun crackle. A truly awful sound for an Alfa. Tremendous performance boost though, best midrange pickup of all the setups here.
6. Straight through centre pipe (ragazzon), straight through end pipe (raggazon).
-Tremendous sound. Turns heads at any rev. In everyday commuting you will only hear a car this loud maybe once per year, if that. Sounds like:
-the sound of an entire hellsangels gang coming from the same object.
-a nascar racer.
The sound in midrevs is clear and well defined. Higher revs sounds awesome.
In a quiet town when driven normally (upto 4k-5k) the car can be heard from over 1 kilometre away. The problem is that the specific car (which is rare to see, but not uncommon), simply does not make this noise. Biggest disadvantage is the attention it draws in the lower revs. There is also a tremendous bass drone around idle and from 1000-2700 rpm. It is very noticeable in traffic and to police. 0-2700 actually sounds like the exhaust is broken, or has a hole in it. It therefore sounds unfinished.
The crackle on overrun is clear. The overrun crackle is the least bassy of all the setups but still isn't as clear as for example a Unicorse (with overracing) setup.
Listen to it here at 2m20s.
YouTube - Alfa Romeo 916 3.0 24V unsilenced Ragazzon 1. windows down
Or see other vids of this setup here:
YouTube - gold333's Channel
*note you cannot hear this setups biggest letdown; the lowdown bassy drone in the youtube vids.
In my country (NL) all cars have an homologation specification, the car makes more noise than anything in the city, therefore it is easy for police to look up the dB allowed, and see that it is 20 or so dB too much. There are 2 procedures, one where the police perform a dB check, the other when the car is so loud that it is obviously above spec, and there is no need for a dB check. This setup falls firmly in the second category. The car is impounded along with your registration, you are fined and given 4 weeks to rectify the car, and must drive it to the only inspection station that legally can check dB's. Although this didn't happen to me it sounds like tremendous hassle.
7. Homemade center muffler (Eurosport exhausts item ES530067 ) on rag straight through, end straight through ragazzon.
-On the advice of Big Dog. This sound seems to be like setup 6 but with reduced bass around idle, and the same clear note and crackle of the open system, but with more manageable overall decibels.
Video of this setup:
Box should arrive next week, I'll get it welded and report back.