As I'm overindulging here, I may as well as a personal favourite of mine.
The American's say there's no replacement for displacement....how wrong they where. Ladies and Gentleman, I present the Honda F20C inline 4.
240bhp from 2 litres...standard. A bit of mild tinkering with the CPU, air intake and exhaust will see 260/270.
Yea it has no torque, but it is sublime from 5k rpm through t its 9.2k red line.
Now if only Honda made a 4litre of these bad boys....
Here once again is the sound if you car for such things.