I agree on the shavings, regardless of how harmless they may be, you are bolting on an aftermarket device which is usually documented depending on the dealer/technician. I'm not giving them any reason to void what little warranty I have left. My Rx kit is installed on a 2013 SHO which has documentation on record at the dealer noting modification to the BOV, installation of CAI, and an "unidentified" modification to the PCV system. I get to see these notes on every ticket I get if they service the vehicle.
Back to the drilling; it is my understanding the SHO is the tightest on space in the engine bay to install the kit on. Perhaps this is why there are relatively few write-ups on them. Despite this, I found it fairly easy to loosen the coupling and just take the rear pipe off to drill. With your engine also being transversely mounted, but with a larger bay, removing it to drill should be a piece of cake.
Having OCPD (took me 2 weeks to get it exactly the way I wanted) I decided that I wanted the rear pipe's tap location to be the same distance from the turbo inlet as the front where I was using a factory snap connector and the OE port left when removing the front PCV hose. I have NO evidence this is in any way beneficial or necessary, but like I mentioned, I literally can’t help myself.
But to each his own, and it is totally possible I spent extra time that was wholly unnecessary. On the other hand, as I intend to create a detailed SHO installation write-up, I took about 150 photos throughout the installation. Here is a photo of the shavings I didn’t want entering my turbo inlet simply out of an abundance of caution.