*disclaimer - the HKS Works engine developed 276 HP in N/A form. Big jump over the factory SOHC output of 98(?)ish HP. Destroking the 4G54 seems a bit 'wasteful' but if you've even driven something with the now near extinct 4G52 2 litre engine, the 2 litre is more responsive and quite happy to rev when given a dose of right foot - so that is a fair call on destroking. The stock inlet manifolds are bad for performance as well (2 different length intake runners?). Check out some of the performance mods like balance shaft deletion, porting and head work, changes to the intake side of things and even EDIS ignition. There are good gains to be made not only in HP but fuel economy as well.