I just went through the procedure of ordering my C8 about 5 weeks ago. It is supposed to be built the second week of December. The same thought occurred to me about ordering a lot of the options through the parts department and saving the 22.6 % luxury tax (20% +13% HST on the 20%). Including the ground effects package, mats, car cover, rad screens, battery tender etc. my tax savings came out to about $1,600. The salesman did tell me that the dealer is supposed to collect the luxury tax on parts ordered that were obviously intended for the vehicle, but they had no plans to do so. The one possible downside in going this route is that, if it is important to you, these options will not show up on your build sheet / window sticker. The only other car I have purchased directly from the manufacturer with my specific options is my 98 C5, triple black convert 6 speed with 62,000 kms. I still have the original window sticker from that car. Monetarily, it has no value, but sentimentally it is important to me. I hope you all have a nice day.