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I'm in the slow process of building two 2-1 merge collectors for two different motorcycles. A member on another site for motorcycles figured out the dimensions of the primaries for each bike, OD and length before merge. He used an exhaust design program he has at work. I don't know which one it...

I think pics may be clearer, I'm still kinda confused with the drawings. Have you seen the pics of 2-1 merge on Burns Stainless website?

My comments pertain to American Pump Gas. Consider Race gas completely different. Do you know how similar you gas there is to our gas here? In the US, as the octane goes up the efficiency of the gas goes down.

Are you serious about the LS460, 11.8:1? Wow. Technology. How similar are the pistons and combustion chamber shape/design of the LS460 and LS400? Do you have a pic of the OEM LS400 piston for comparison?

Obviously one is an I-6, the other a V-8. Are the pistons and valves the same in both? Bore and stroke? Combustion chamber design? I'm just wondering because it would seem that the cylinders displace the same and a good efficient design would work on either style of engine configuration...

Wow, I hate to be the new guy here and revive this thread to correct some of the mistakes but I feel it my duty to do so. Most of what has been posted above is wrong or opposite. Lower octane burns more easily and hotter, makes more power and is cleaner. Only an engine that will...