Currently this engine uses a 4-2-1 Setup with a crossover a few inches away from the exhaust port on the header primaries, only on cylinders 2 and 3(which is well before the first collector) This Engines Firing Order is 1-2-4-3 The Crossover linking Cylinders 2 and 3 confuse me since are not paired. Since Cyl 2 Fires then next to fire is Cyl 4, so there isn't any scavenging from these two (Cyl 2 and Cyl 3). I believe this is done to alter the sound of the exhaust, is my assumption correct? I have an idea to create a dual exhaust system which (Cyl 1 and Cyl 2) and (Cyl 4 and Cyl 3) Are paired So the exhaust is a Dual 2-1 system. But, now two cylinders will not receive scavenging (Cyl 1 and Cyl 4) To Remedy this I propose to put crossover pipes on the header primaries between (Cyl 4 and Cyl 2) and (Cyl 1 and Cyl 3) So now all cylinders can receive scavenging. What are your opinions on the system? Is there any literature on crossover pipes in headers?