hey guys. i just got a TRD rear valance and i was wondering wat it takes to modify the TRD regular exhasut to fit the valance, can i just take the exhust off and take it to a muffler place and have a piece put in to make it longer>? like say 4 inches? but is that the ONLY other modifications that has to be done?will it fit ok? how much etra lenght is there needed? let me know, thanks alot guys. peace. Jon