I am looking for a performance back box for my 1.6 SXI. I have got some choices in my mind like Magnex, Jetex, Peco...I want some deep sporty tone rather than those very loud one. Also I am still thinking of purchasing a full system or just the rear box as I dun wanna empty my bank account! haha...Could you guys gimme some suggestion? Is that a good idea if I just change the back box at the moment then purchase the cat-back later?