That's the question the SDR Sports Cars WR3 V-Storm attempts to answer with McLaren-F1-style seating and turbocharged Subaru power. Complete cars cost just $32,700 if you're lucky enough to live in Blighty.
That boxer four develops 300 HP and the whole shebang only weighs 1,100 Lbs, giving it a power-to-weight ratio in excess of 500 HP per ton and a 0-60 time of 3.0 seconds. Don't want to shell out for someone else to assemble your car? Kits start at just $6,534 and you can also use a 143 HP Aprilia RSV 1000 R engine if you want to go even cheaper.