The hex plug route vs. the sandwhich adapter depends upon if your car is an SVT or not. The SVT has an oil cooler whereas the other models do not. This is the biggest deciding factor, because there is not enough space to have the cooler, sandwich adaper and oil filter on an SVT so the installation is limited to the hex plug methood.
If your car is a non-SVT it's personal preference, if you have an SVT, gotta go to the hex plug.
