Exige can be fitted with a variety of engine, particularly the Series 1 cars, as there is so much space in the engine bay.
Most of the early cars have been modded in some way. Mine has a Honda engine from an S2000, along with its gearbox for example. Then a supercharger and chargecooler added, for good measure...among other things
Standard S1 car had 177bhp in the 725kg car. Mine has had various weight reduction measures, but a few things (engine etc) have added weight too, so about even at the end of the day. But now has 350bhp.