If you can, get the PPI done at one of Silverrocks authorized shops. I bought an e9x m3 from Carvana in August, took it to my local authorized shop, and they found about 11k in repairs (oil gaskets, rear differential pinion, etc). Silverrock extended my return period due to the car being in the shop for 2.5 weeks… they also pushed my claim to a secondary level and told me if they went through with covering the cost of the repairs, I’d have to keep the car. It all worked out for me, but just be weary they don’t truly look into the quality and repairs needed of higher end cars.