Similar again to the US spec 1989 and 1990 GTUs the Infini IV came with the 4.3 rear end final gear (but also used a new Torsen Limited Slip Differential), and the options kept minimal with air conditioning, Infini embroidered floor mats, and a AM/FM radio the few options available (however it did come standard with a rear window wiper and power windows). Power was bumped to 215 HP (JIS), largely by changing the exhaust to a free flowing design and revised ECU.

The Infini IV, also came with the Bronze tinted glass found in the US spec 10th Anniversary edition, and was available in one of two custom black/green metallic paint colors. Of the 600 made, the first 300 cars built on limited production runs between June - Dec 1990 were painted Mazda paint code GU (Shade Green) while the last 300 cars built starting Jan 1991 through February 1991 were paint code VQ. Of these last 300, 20 of them where sent to MazdaSpeed for the MazdaSpeed Package which only did minor cosmetic changes like MazdaSpeed embroidered seats, MazdaSpeed steering wheel and shift ****.