It was the Saleen N2O Focus.
I am sure the 2.0L SPI and 2.0L Duratec existed along with the 2.3L. I don't know if the 2.0L Zetec lasted after 2004. I just can't remember how that all shook out with the Focus after 2004. I do remember those SAP (street appearance package) 2005+ cars that were just horrid with all the lick and stick parts stuck on them. I think those all went away when the ZX3/5 was retired. There was the terrible coupe Focus with the SVT EAP wheels and silly rear window spoiler.
I don't know if you have read American Icon about saving Ford, but there was a paragraph in there about why the US Focus became a POS while the European car was far better. The managers all gave Bill Ford some answers about markets, regions, and refresh cycles. Bill called them out on their BS. I felt better knowing that Bill Ford realized the Focus was ruined during the refreshes. Ford is notorious for doing this. Come out with a great car, do a minor refresh, and then do another that lasts way too long and they just keep pulling cost out of the car. They wonder why sales keep slipping and just kill the car. I look at our 2013 Escape Titanium and it looks and feels vastly more upscale than my sister's 2017 Escape Titanium. Everything just looks and feels cheaper, there are less options, and you get less value out of the car. Yet, it costs more.