So just installed a HPS sri Intake on my 2015 Si and such a great upgrade. Noticeable smoothness in power. Super throaty sound in the higher rpm range and a breeze to install, no CEL. Found a nice "performance red" color one on the bay for $261 but was able to catch 10% eBay bucks off it. I was undecided between the K&N and the HPS. I had an HPS installed on another car before and I liked the dyno of the HPS better compared to K&N charts. Price was better and still came with a nice heat shield similar to K&N setup. Will get a few pics once we get some sunny weather here in great ol' CNY. Once again very glad to have gone with HPS.