here you go...

pipe cc = engine dispacement cc's

If you have a twin 100 each pipe must be at least 50cc's. Some guys (like me) are going one size up to get a little more quiet and keep the engine from being so peaky or "pipey". KS makes good pipes that provide a mild boost but queit very well. They also make the headers for them. On the bigger gassers they are really the way to go. If you would like to see these you can go to www.desertaircraft.com . It's also best if you have a twin to go with two pipes. 2 into 1 setups can cause surging in the low to midrange.