well, if you buy the kit, it should come with a fuel pump and a FMU....... i would do exhaust first....... just for the power.......

but as far as can you do it, yes....... it shouldnt hurt anything......... and the kit should come with whatever you need fuel wise for a good bit.......... on a stock cobra with some ehaust or something you'll be fine with an fmu and larger fuel pump........ but later on when you get a bit more stuff, you'll prolly wanna go ahead and get some bigger in injectors......

just get a cheap h pipe and a nice catback for now......... then if you want more power down the road you can do the longtubes.......