The irony is that when that car was in production the loudest sound it probably made was KITT's whooshing noise when the red lights moved back and forth across its bumper.
That series had engines from a 2.5 litre 4 cylinder that managed to develop 145 bhp through various V6s that struggled to put out more than the 4 pot all the way up to 5.7 litre V8s and 210 horses. Don't forget that at the time, US cars had their power rated SAE, or nett, in other words at the flywheel and didn't include things like alternators or power steering pumps.
In the context of how the mighty are fallen, the last of the high power Firebirds was the SD455 (7.4 litre) and put out 290 bhp, as opposed to a few years earlier, say 1970 to 1974 when 370 hp was generated. By the late '70s the Vauxhall Royale was putting out 177 and the later Senator around 210 from a 3 litre straight 6 and BMW 3 litres were even higher.
With one or two exceptions, the US automotive industry steadfastly refused to develop their engines and simply made them bigger but stuck with the cast iron block and head with 2 overhead valves per cylinder and one camshaft sitting in the Vee. Electronics have played a big part over the last few years, but their basic architecture is firmly embedded in the 1950s.