Talk:Research & Development/Mazda RX-8 Special Edition/@comment-33956852-20180719133644/@comment-27403942-20180719144555

See elsewhere for confirmation. After Test 1: upgrade Nitro one level. After Test 2: use the free upgrade for Nitro level 2. After Test 8 (Lab 2): use the free upgrade to reach Top Speed Level 3. After Test 18 (Lab 3): choice of Nitro level 4 or Top Speed Level 5. Regular prices are 1025 tokens for N4 and 399k credits for TS5.

For me, I can get 400k credits more easily than 1000 tokens, so I’m going with N4.

NOTE: THERE ARE ONLY 3 FREE UPGRADES, NOT 4.