I love the lane change assist in my wife’s Yukon. When they added the same feature to the new generation of 991 cars I lusted a bit. Adding it wasn’t an option so I opted for the next best thing (although as I use it I’m starting to think that it is the best thing): Aspheric Mirrors!
Function: most of the mirror is flat and works like a typical side view mirror. However, the outer edges are concave and provide a larger, albeit distorted, field of view. You get a few more feet of side vision and this completely eliminates the blind spot on both the left and right as cars come from behind. As a car passes you can see that car in the side mirror all the way until it becomes visible in your actual peripheral vision. It works extremely well. Additionally you get a much larger field of view behind your car which makes it easier to back out of a parking spot.
Installation: As far as modifications go this one is among the easiest. The mirrors simply snap out of and into place. The only danger here is that if you’re not careful you could potentially crack the mirror. My video below demonstrates the removal, installation and function of the aspheric mirrors on the 991 platform.
Cost: The mirrors are expensive- there’s no question about it. The only real consideration here is how much do you want to see? Realistically you only need the driver mirror as it’s difficult to crane your neck around and look behind you. The passenger mirror is not absolutely necessary but I wanted my mirrors to match (cause I’m a freak like that). I felt they were worth it to me personally because I have struggled with blind spots and have difficulty turning my neck (due to an injury).
I admit I am perpetually looking for ways to modify my vehicles so I don’t really need a good reason to do stuff like this. However, having done it I’m very happy with the upgrade and would definitely recommend it. It’s good enough that I would probably consider skipping the lane change assist feature on a future 991 and simply adding aspheric mirrors. Shocking, i’m sure.