This may be a weird question, but on any of SIII V12 owners with original exhaust and tips, are all 4 ports used and have "soot" in them?

Mine does not, only the 2 middle ports are used. Not sure what would cause this. I also have a whistle at high acceleration.

Pic:

 

Jaguar went from four exhaust outlets to two in 1974. The earlier four outlet exhausts had a muffler with four actual outlets so all four openings would emit exhaust gasses. I suspect you may have a later, two outlet muffler hence only the inner two are actually connected to the exhaust. If your car is a '74 the four fantail exhaust is not correct for your car. If you have a pre-'74 then it's likely at some point an incorrect rear muffler was installed.

 

I'm not sure when this was posted, but I just went and looked at my E.
The 2 outlet tip will not fit the 4 outlet muffler or the other way around, so this is very weird.
I have a 2 outlet that I no longer need
In fact I'm trying to find a 4 outlet tip.
Anyone out there have one?

 

https://www.sngbarratt.com/us/#!/Eng...R%204%20OUTLET