Have this valve cover gasket kit fits the i8 perfectly the .5 comes Kit is actually better than the OEM kit, but the valve cover is not. I use FBO with E50 stage 2+ and the valve cover only lasted 2 months on my car and then it started melting on the sides and I started leaking a lot of oil. The bolts are also cheap aluminum, so don't be surprised if they break. This kit is suitable for production vehicles.