Thats because it was a 95. slowest of all the 240's after 90.
To add the 450 injectors you will HAVE to add some way to manage them, or you will run WAY rich and wash the rings in your motor!
Some sort od SAFC or Emanage at a minimum. These are capable comping up to 150% of original injector size. I dont know the stock injectors in a Prelude so I cant say if it will work. If 450's are too large to be comped by either of these, you can go with smaller injectors (turbo automatic DSM's have 390cc) or with some sort of stand alone fuel management will be able to controll ANY size injector. Also the DSM injectors are low impedance and will need a resistor wired inline with each injector or you will burn up your ECU. You will also need to be able to retard you tming under boost conditions. An E-manage can do this with the optional ignition harness.
