done the same with mine,4 branch manifold and de cat pipe, part longlife exhaust(swansea branch very helpful),and part powerflow exhaust,but it is tad noisy inside car but sounds lovely from outside,but i am toying with putting decibel killers in back box just to quieten things a littlealex ye said:wel my zafira had a hid headlight .and a cat bak exhaust, but i think its too lound. i cant stand it when i get on motor way!!!