i need your help, several days ago I have bought apexi muffler, it has not catback system there is only a muffler, i want do catback system myself. how would be better? from cat converter conduct new pipe, or just weld little pipe to muffler. how would be better leave stock pipe? or do new from cat converter?

 

buy World Sport 2 and call it a day....

or if your going to do it yourself, buy a header and make new pipe from that back, but if your in a stupid state that has stupid emission laws then keep your cat or make a test pipe