Some crazy Japanese slapped a turbo on a Kawasaki ZX25R (inline 4 already revving to 18 000rpm stock) and got 100HP and a 249km/h top speed
https://www.bikesrepublic.com/featured/turbocharged-kawasaki-ninja-zx-25r-hits-249km-h/
https://www.bikesrepublic.com/featured/turbocharged-kawasaki-ninja-zx-25r-hits-249km-h/