sweet. 240 oringinal came up with the idea of enlarging the inlets. He did a few sets of them for members here. I own a set. Later, after 240 moved on, Rob decided to improve upon 240's design and now sells the "tweeked" manis. They "look" stock and that is the appeal I liked with them. And they add a lot of low end power. 240 manis are no longer available...and Robs design is much cleaner and the only one's available now. Hope that clears things up...