You don't want to replace SS lines in your case.

If yours are in bad shape, replace them with OEM.
Try to bleed the brake system and put new fluid first... Replacing OEM rubber lines with stainless steel lines is to avoid rubber expension when the fluid is getting reeeeealy hot. For any kind of street driving, you will not get that temperature... only on the track... Not worth the moeny to try...
Replace with ss exhause for lasting 5 years? Is it worth doing that?
What car do you have?