DONT KNOW WHICH CATBACK SYSTEM TO GET!!!!! I NEED HELP AND QUICK TOO

[civic_k20z3a]

ok so i drive a 2008 honda civic si sedan and i dont know whcih catback to get....my choices are either the greddy ti-c catback system or run a 2.5 in custom exhaust pipe from the header to the back and weld the HKS HI POWER exhaust....so can someone help me wit my choices plz i need ASAP

[silverDA]

any will do but i hear dopeboys run spoon.

[punkr6]

Vibrant muffler with custom 2.5 in piping...