I just want to add a suggestion to your friend that he clear this up on his own terms. It very well may be that he has lived a normal life for the past 11 years, but this issue could come back to haunt him at any time, and might be very inconvenient and expensive to deal with. 11 years ago he was able to get a job, but if he ever needs to look for work again a background check today is a lot different than it was back then. With computerized records his arrest warrant will be found, and he will be arrested, and as a flight risk he most likely will be held without bail.
The attorney's fees will be huge for his family.
Jail time will mean lost employment and lost wages.
Considering that at my kids schools, the PTA runs a background check on all sports coaches and parent volunteers sooner or later this is going to come up.
How would your friend feel if he was driving down the road with his 11 year old kid, gets pulled over because he doesn't even realize he has a burned out tail light and gets cuffed & stuffed by the cop when he runs a basic warrant test? How would he feel if some overzealous prosecutor charges his wife with harboring a fugitive just to make a name for himself? How would he feel if his kid(s) are taken from him and placed in foster care? Clearly this is the extreme, but wouldn't it be worth it to find out if he can pay his fines and get this warrant discharged?