If you're chasing hidden classics in Japan, the Barn Find hunt is tied much more closely to exploration than before, and it pays to plan your route before spending hours driving in circles. The big thing to understand is that FH6 Cars locked behind barns don't all appear at once; they open up through the Discover Japan Collection Journal, so your stamp progress matters just as much as your map knowledge.
You'll start with only a small number of rumors, then more appear as you move from Visitor to Master Explorer. Stories are usually the best use of your time, especially the yellow-badge events, because they push exploration progress quickly. Street races, touge runs, photo spots, food deliveries, mascot tasks, Drift Club events, day trips, and vehicle collecting also help. Don't ignore them, but if you're in a hurry, hit Stories first and clean up nearby activities while you're already in the area.
The order is fixed by stamp tier, though your personal discovery path can feel different depending on where you drive first. A useful habit is to unlock a tier, check the new search zones, then group nearby barns into one trip. ANNA's drone helps a lot once you're close, so don't be stubborn about searching every tree line from the road.
Ohtani holds the NSX-R GT in the southern river valley, the Porsche 911 Turbo in bamboo near a road split, and the R390 GT1 close to the Ohtani-Shimanoyama border. Ito has four finds: the Toyota 2000GT near the coastal trees, the Sierra on a small wooded hill, the Diablo SV below a three-way junction, and the Skyline Super Silhouette on a southwest dirt track. Nangan has the Skyline 2000GT-R near a southern dirt path, while Minamino hides the Nissan Pao off a western forest route. Hokubu's Lincoln sits south of the flower fields. Takashiro includes the Pennzoil GT-R near a U-shaped road and the Mazda 787B in the northern woods. Shimanoyama rounds things out with the Peugeot 205, Montero Evolution, and Lancer Time Attack around hill roads, forest paths, and the ridge above Narai-Juku.
Finding the barn isn't the end of it. The car goes into restoration, and you'll either wait or pay to speed things up. I'd save paid skips for the rare stuff, especially the Mazda 787B, Nissan R390 GT1, and Honda NSX-R GT. The Treasure Map can show locations, but it won't remove stamp gates, so progression still comes first. If you want the full set of FH6 Cars from barns, work through the journal, use the drone in each search circle, and treat every new tier like a short road trip rather than a random treasure hunt.