Originally posted by xbubbax
Although the Kats do have small intake and exhaust ports compared to a one liter engine, they do still custom cut the needles and alter the jetting some to ensure complaince with certain requirements, as the bikes comes from the factory (sound level & exhaust gas complainces required by DOT/EPA/etc). This is why stage 1 jetkits exist for the Katana's -- to remove the artificial power reductions at certain RPM levels induced by the stock needles & jets. And a stage 1 kit will bring benefits with the stock exhaust and air intakes (i.e. - without any other "concurrent' mods).
Cheers
=-= The CyberPoet
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