I recently had my SFCs installed. Here's what they looked like all nice and painted:
As others have discovered, sometimes the exhaust hits against the DS SFC. The easiest fix is to wrap the SFC w/ radiator hose. My shop suggested cutting the exhaust and moving it slightly to avoid any collisions (seems to be working so far):
Pic of SFC installed. The shop did a very nice job w/ the welds, they are very difficult to see after the shop touched up w/ black paint:
Just a litte reminder of what these SFCs were installed on: