I'm mildly recommending just a header. Because that's what I would LOVE to do to mine (but won't, I want to preserve the powertrain warranty and preserve the cheapness of the car). I'd love to be able to tune the fuel map, pull both cats out, and adjust mufflerage until it sounds like what I would want. Just about 50% more burble than what it has now. It would be awesome if it would sound like a Triumph triple. But I think the Triumph triple sounds good due to higher rpm.
Our lower rpm makes the engine sound more like a Civic fartcan, so I wouldn't want it too much louder. Plus, low rpm equals low fuel consumption, so I tend to run as low an rpm as the conditions allow.
__________________________________________
View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)