It's not that its difficult to add the fluid. It's that I have about 2000 miles on it and I already have a problem with it. I've been doing a lot of reading on here and see that a lot people are havingbthensame problem. After I filled it I received and error saying that the system has malfunctioned and speed will be limited. After asking around locally most are saying rip that piece of crap out of the exhaust for less restriction and use the h&s programmer to delete it. Supposedly I'd get around another 5 mpg. Not sure though. Thats what led me here.