So. Thats probably a 22r. Its unlikely to be a 2rz. So that means you should replace it if you want something sportier. They are a grunty yet truckish motor. Not really inclined to rev and a simple head design. Grunty more than revvy or sporty feeling. That said you can buy aftermarket parts for sfa in the US for the 22r due to their presence in many off road cars that get heavily modified. Have a google, there are a few sources of built heads and engines there. If the mileage of it is high you might be best to keep trans and diff and look for a 3sge or 3rz conversion for it.