To estimate the price of the 2015 Subaru WRX I4 2.5L Turbocharged STi RG Package (Mid) with 158000 km mileage, I first considered the selling price of a similar 2015 Subaru WRX I4 2.0L Turbo Charged STi (Top) with 156000 km mileage, which sold for SAR 37500 on 2024-07-04. This car has a slightly smaller engine and is a higher trim, which could affect the price. The accepted offer for the same model and variant was also SAR 37500 on 2024-07-03, reinforcing this price point. The listed prices for similar cars include SAR 53000 for the exact same model and variant, but listed prices are generally higher than selling prices. Other listed prices for similar models range from SAR 41500 to SAR 72000, but these are for different variants and model years. Considering the selling price and accepted offer, I adjusted for the specific variant and engine size of the target car, leading to a slightly higher estimate than the selling price of the 2.0L variant.