1) You can definitely notice a difference with the intake. It's not super huge but I'd say it's definitely a worthwhile mod. It would be more noticeable with an aftermarket exhaust system/header to maximize airflow.
2) It's a combination of a bunch of different parts (i.e. it's not an off-the-shelf kit). I explained it in more detail in the first couple posts of thread, but in short it's Skyjacker springs and shocks, Rough Country X-Flex control arms upper and lower, front and rear, Rough Country adjustable front track bar, JKS adjustable rear track bar, JKS Quicker swaybar disconnects, JKS 1.25" body lift, Currie 1" motor mounts, PORC SYE kit, Quigley rear driveshaft, and a UCF extra clearance belly pan (steel).
Long story short, I bought an off-the-shelf economy Skyjacker 4" kit and regretted the decision before I installed anything, so I sold the control arms that came with the kit and made a list of what I thought I'd need to add to make it a respectable suspension. I am very happy with how it has turned out.