I'm thinking of getting MAC longtubes, MAC shortty o/r prochamber, and borla stingers. Do i need to purchase any extra hardware for a shop to do the install? My mustang is a 2003 gt with about 73000 miles on it. I dont care about the MILs or O2 extensions because i will soon also get a SCT tuner and i should be able to turn that stuff off correct? I'm more worried about gaskets and things like that. I just want everything in the install to be smooth and how much do you think labor will be? yes i know that it might be expensive because of the longtubes.

 

You have to get O2 extensions or your car won't run. You don't "need" anything else.

 

or you could just buy longer o2 sensors if they need to be replaced.
your headers should come with gaskets and maybe hardware.
the exhaust just bolts up
as for labor, not sure. i just did it myself. get multiple quotes if possible.