Nice. It takes me ~8 hours for a similar full detail. In lieu of washing the door jams I've started using waterless car wash and I do it at the end. Although I don't do any specific treatments for black plastic or seals. What do you use?
If I'm correct, you could lose low end torque, but gain @ the higher RPM. That is what my research told me when I was looking to upgrade on my 08 Impreza.
Wow, I really like those rims... What are they?
IMO, the 20's look good but that is about it. I'd be more concerned about the ride quality and running around on rubber bands.
SSM is great..Easy to keep clean and easily hides minor scratches. You also don't see any minor swirl marks either. Oh and it's still a shade darker from other silvers out there.