It wasn't easy to find the right exhaust system for my 1600 cc Alfa 105 engine. I prefered the CSC Marmitte steel sport exhaust system from Italy. It fitted exactly to my engine. Here you can see the 4 in 2 manifold. I'd better sprayed it with VHT Manifold Colour from KTS American Parts. What's your experiance with that? Does it really withstand 820°C? The first silencer is competely replaced by a flexibel joint.
The sound is very exciting but not too loud. Increase in performance? - Dont't ask!
I purchased it from Stefan Götzelmann Vintage Alfa Romeo Cars. Nice work!