Exhust Hi all I`m in the process of altering my exhaust set-up on my tls to a dual underseat exhaust which has been costume made from my diagrams and also a stubby style/gp megaphone style. When looking from the rear of the bike the underseat will be linked to the left handside exhaust and the stubby will be linked to the right handside exhaust. Here`s the dilemma I`m looking to have the front/header pipes made from stainless but do they have to be identical to the original pies or can they be made to be straight through or will this affect the way the torque of the engine or can this be sorted via a dynotune.