plus the blue and yellow livery / paint scheme, and the real spoiler not the small flat one on the basic street car.

2008 Impreza WRX STI
Starting at $34,995*

l think they are about $400,000. Just the transmission costs $150,000 and the differentials cost $20,000 each, front and rear. You could imagine what the engine costs if the Tranny alone is $150,000.

At SEMA in Las Vegas the Subaru WRX factory race cars claimed around 900hp & valued them at over a million dollars each. l have no idea how they could get/claim this type of horse power, I've also seen a claimed horse power hovering around 600hp, not sure if this is even possible ????

The USA rally car is a LOT less money:

ENGINE:
Horizontally Opposed 4-Cylinder
Turbocharged & Intercooled
Approximately 320 hp & 425 lb-ft Torque
(with a Rally America Open Class mandated 34 mm restrictor)

You can get a complete replica body kit from L'aunsport in Japan in both wise body and non including the big spoiler with all the fins. But they make their kits to order so it is a lot of money. Last l looked l think it was something close to $15,000 for the complete wide body kit. You should google them and check it out. The kits are very high quality.

You asking for the Subaru Impreza WRX rally car cost? Mods & to meet the specification for a rally car, u probably spent around 300k or up to just tune it, light weight it, change the suspension, etc. You can name it. Yes, the tranny cost roughly 150k (probably less if u can find a used one).

If u asking for the Subaru Impreza WRC car cost, it probably marked at the 500k to just get the replica of it. Few years back there were STi P1 & Sti RA, both of them r close to the rally car; but still far to compare the real track car.