Neat...did not know you could fit four-pots to the gearbox of a Sud with room to spare and all that braking force upon the dynamics of the set up.
I did not think there were ANY rotors that would fit...!? Well, in terms of performance inboards for the Sud.
I think for expense and ease I would leave it yet, for performance, yeah...I would definitely change them because its not THAT hard really. You just have to have access to a wreckers or dissmantlers for Euro fare. I was lucky in that regard.
I think I would dissagree with you in terms of braking is better though, not trying to sound like jack here at all, and cornering...well, again we can agree to dissagree there. But at the end of the day, at least there are more options to think of though:
1) Inboards as stock with uprated rotors/pads - with uprated lines, rotors, pads, fluid if needed.
2) Inboards with Brembos with uprated lines, rotors, pads, fluid.
3) Outboard conversions with rotors uprated lines, pads, fluid.
Are you going to split the gearbox jbyatt or upgrade it in anyway? Usually second gear really goes in those boxes.
As i said , one of the reasons that the brakes failed was the fact that the air inducts were removed. another reason is bad maintenance or wrong setup when changing pads ( no proper spacing in the calipers) . As for standard brake fluids and lines , well this goes the same for outboard .
oh , also , you can fit 4pot brembos inboards as the competitions Sprints were without worrying for weight or rim size. And you do corner better with inboards ...
I think there is a photo of them in Haynes manual....
On the other side , any work on them is really painful and requires lots of afford and that if you ever find someone to know hot to deal with them.