I had an Infiniti 1991 Q45. It had a fuel injected 4,5 liter dohc 32 valve V8. Officially rated at 287 hp, I suspect it was more like 330 hp. The same engine powered some cars sold in Japan where there was a 290 hp limit at that time. Hence, the conservative horsepower figure.
The car was rock solid. I called it "my luxury hot rod". I drove it over 200K miles, only having to replace an exhaust system.
Sadly, I think that was the high point for Infiniti. I had no interest in their later offerings.