Madac were a french exhaust specialist who have been bought and absorbed a few years ago.
The system has no centre silencer (as specified when ordered) the tip is probably a 2x4.5" oblony with round edges that are rolled inwards.
The backbox has some scrape marks from running at -130mm
When I had this fitted (with a Green filter and knife edged TB) I was at bollywidden castle displaying at the show and someone was convinced it was a VR rather than a 1.4!
Lovely deep sound with zero boomyness. Really smooth sound and not too loud until you get up in the revs
Probably gave some power but cant reember specifically (and I was living at altitude so the gains are all different anywat)
You can see the tailpipe in this pic
More pics on request
If there is anyone reading who remembers this car on the scene in 02-05 please post up with your thoughts on the exhaust.