I think you are a bit misinformed on this avenue, The cars that arrive as cuts are almost always smashed. A scrappie would not bid for a working car and cut it up, its cheaper to ship a car as is rather than pay to cut it at port of origin. These cars/parts are not modified in any way/shape/form from the destination port to the scrappies godown right to the scrappies shop.
If you think that these scrapped cars are smuggled, you are very misinformed.
The old smuggled cars from afghanistan were/are mostly the toyota hilux truck, LC models, corolla wagon models but they are identifiable as they are not of japanese market.. I lived in Karachi and have some ties to customs too, the scrap leaving from Karachi port to Afghanistan is not JDM cars.
I write this from experience of running a car repair business in Pakistan. This JDM craze is not new, Pakistani people will spend a lot of money for vanity just to be the talk of the village/town/neighborhood.
the old craze was the tons and tons of 1984-1990 corolla sedans in every flavour imaginable, Their engines were the emmissions type 2E engine which had about 1 kilometer of vacuum tubing, more if it were an older model with the 2A engine.
The craze was revisited with the coronas, accords, concertos and mitsi galants in the 90s. The GDI Galants take the cake, even with "trusty scrapped parts" the cars were unusable as they had a very unique injection and ignition setup. The mid 90s accords had climate control failures that required parts from the same month/year cars. The 94 model module looked the same as the 97 but did not fit or work in other models, The Inspire model accords were real pain for their owners, Just replacing the blower motor on that car requires to pull the dashboard, Servicing the auto trans requires to pull the powerpack intact from the car, ABS module (sumitomo silent type with own special hydraulic oil) was extremely rare and they went bad quickly in Pakistan because owners never understood the concept of changing the hydraulic oil on a yearly interval.
Then they are the special people who bid to buy a UK spec Mercedes Benz/BMW/Audi vehicle and then wonder why the hell it cannot be correctly serviced - while their relatives living in Harrow tell them that Williams garage down their highstreet can fix them easily.
The people who spent monies to buy those cars had to face insanely big losses in the shape of "downtime" and "ultra expensive parts" you also know that Pakistani businessmen are famous for gouging customers, so all the JDM type used and scrapped or even new parts that were usable suddenly would become 3 times more expensive than regular ones.