Ford of Europe then developed a second - generation Focus ST, full of character with its 222 - horsepower turbocharged five - cylinder engine providing an offbeat engine soundtrack. (automobilemag.com)
I would categorize this as «can't be done», unless you manage to make the engine really quiet (e.g. electric motor) and then have loudspeakers playing a synthetic engine soundtrack. (mechanics.stackexchange.com)
The rearmounted six - cylinder horizontally opposed engine soundtrack plays clearly through the standard sport exhaust system. (porsche.com)