ive been looking for a while for a new performance backbox for my astra mark 4 1.6 8v. my friend just got a new one for his polo. its made by scorpion. its called a letterbox i think but comes out then up. its sounds really nice and its the design i want. but find the same design for the astra. ive found some by sportex, but they look a bit tacky and i dont know wot there like. Any suggesions on good sounding exhausts and links are very welcome!