Includes a high accuracy nitrous pressure gauge and a billet aluminum manifold that has two 1/8 npt ports allowing you to connect the nitrous gauge as well as another 1/8npt accessory in-line with a D-4 or D-6 line.
Things that could pair well together with what you are looking at...
Messaged Brian about the thought of doing coilovers and sway bars on my c6. He called me up and we talked for probably 30 min, awesome guy to work with/shop with. Definitely would recommend this company.