I know you have been asking many questions. This group has many experienced Solstice people that are more then willing to assist you. Some can tend to be jerks and just ignore them. You seem to. E making some decisions. Hopefully your local dealer is a good one. The dealer can order the gmpp tune or you can purchase from a place like crate engine (which is actually a gm dealer) but whomever you buy the tune from, I would order the pigtail for it that crate engine developed an sells. The pigtail and tune should be installed by your gm dealer. Pigtail saves dealer installation time and definitely saves you from future problems. I wish it had been developed when my cars were tuned. Again your best having dealer install and do complete job. Now the brace kit and any other aftermarket item you decide to add will best be handled by you ordering and a local shop installing. I know the problem is everyone has an opinion. Of course mine are always correct!!