Cracked Headers F430

OK guys, everyone has been helpful so here is another issue. Got a CEL on my '07, hooked up a scanner and got code PO455. Looked that up and found that the headers are a known issue on the F430's. It seems to run fine right now, no noises or misses. is it safe to drive to the dealer 100 miles away (all highway)? Could the CEL be a sensor issue? If I replace the headers with after market ones, should I also change the exhaust? If I put after market items on, what is the best combo (Tubi,Fabspeed,Capristio)?
I have searched the forums, unfortunately I didn't get all the answers I needed. Thanks, Fellas!