I can't comment on their durability. I had all hell trying to get the header/coupler to stay on and then when it popped off the first heat I ran it the whole setup got demoted to pit box.
Manticore and the crew posted a tip a while back about cutting your stinger down some, I've done that to my RD and it's taken some pretty massive hits and held up very well.
Toughest pipe has to be the paris but it's just too darn ugly to be on any car I own
