Dual exhaust not reallyet advisable unless ur car is a sports car.. if u still like the dual exhaust.. perhaps u can make one side as dummyou and the other side is the real exhaust.. all depends on what car and ur engine brother

not like you have 2 banks of cylinders... and heck most
if u dont want a fake piece, and really want to add an additional pipe, might as well cut your losses and split the pipe as far back as possible....

u will gain nothing in performance on a dyno (dont performance will go down if its split very far back) BUT you will be adding dead weight on the car so yeah~~

also imo... that kit does not need twin pipes to look decent