HeadeR, not headeRS - only us V6 and V8 boys get 2. And the worst that can happen is you buy some that are too long and lose 2 lb/ft of tq down low before making up 4 up top...or you buy too short ones and lost 2 tq up top while gaining 4 down low...

Actually, on second thought, the worst that could happen is you don't tighten them right and have exhaust leaks which end up tearing shit up in the long run...but you don't sound like you're capable of or planning on putting them on yourself so you should be fine with that.