Hey! Happy to hear you're upgrading your headunit! I've been using a DMCPA79BT unit off of Amazon for the past 6 months in two different cars, and now my tC. It has a few bugs (sometimes when you end a call with someone, it will freeze and reboot in about 2 minutes), but overall it is a fantastic unit for under 300 bucks. For your tC, you will need a wiring harness adapter. Go on Amazon. I found mine for 5 bucks. It's essentially an adapter that plugs directly to the factory clips. You'll then have a bunch of wires coming out of that adapter, and a bunch of wires coming out of the headunit. You'll essentially just match up the colors and connect them. Make sure you double check the wiring diagrams though. If you have a factory subwoofer, and you would like to retain it, take the power antenna wire from the factory side and connect it to the remote turn on wire from your new fancy head unit. I have a 2005 ajd that worked for me, it should work for you. I've had fantastic success with this headunit and despite its few glitches every now and then, if you're on a budget, this is the way to go. Headunit- https://www.amazon.com/Dual-Electronics-Mechless-Digital-Receiver/dp/B07TNGWMQY/ref=mp_s_a_1_4?dchild=1&keywords=dual+dmcpa79bt&pd_rd_r=d5bff800-474a-415d-9f9f-f01d14c687ac&pd_rd_w=sTGn0&pd_rd_wg=U3pnx&pf_rd_p=ce028c81-ed8c-425a-8404-93bf425aa8ce&pf_rd_r=H04QY51PF38RJ4A1GNNR&qid=1628961730&sr=8-4