[tholyoak]

As insite points out, the installation of these pulleys requires grinding down a casting on the case. The one thing you may want to consider is if your motor ever requires replacement you run the risk of Porsche not accepting the old engine as a core in return for a Porsche reman unit as your core is now no longer acceptable as a rebuildable unit. You may get lucky and they won't notice it, but it could turn out to be a several thousand dollar mod down the road if they do.

As mn box s states, if you are simply looking to free up some HP, you are better off replacing the dual mass flywheel. If you are just looking to save the ps pump lines from failure at the track, simply reduce the pulley size on the ps pump.

Just something to consider.

Todd