I installed Draw Tite hitch over the weekend.
Hardest part was taking the bumper off. Other than that.. very straight forward. Having a impact gun helped so much to bolt in 8 of those nuts holding the hitch. Then I got my trusty Snap on torque wrench and torqued to 65#ft spec. My dog got bored and started to fall asleep while I was sweating =)
I have 2012 50i - one thing that was interesting was NO CUTTING of anything. I just removed the bottom sliver plastic trim.. the bumper was already pre shaped for tow hitch. If i had gotten OEM hitch, I think i still would have cut through all the way. But my OEM bumper had bottom back portion already pre cut from factory.
I will run OEM wires this week (ordered for $200 from online) and program with local coding guy. I was going to go aftermarket with modulite + universal 7 pin adapter ($80) but since i found a local coding guy, i rather have oem features. No need to go to dealer =)
As far as 7 pin T One connector, i bought a plate adaptor and my trailer shop will weld on to the hitch (left of it) so it looks like OEM one. I also need to flip the ball mount as I will need a 3/4 inch riser.
Once I get everything installed, i will take a picture of my open car trailer. From reading what people are towing, I think pulling 4500-5000# is no issue.