if the motor is stock im gonna say no, i have an ls with a t3/to4e turbo, .57 trim, .63a.r and stage 3 wheels(pretty big turbo) and on 12 psi i made 250 wheel hp and 226.5 ft lbs torque, seeing as how small the t25 is and how much lower the flow rate of that turbo is compared to mine it would be really hard to make at least that power unless the turbo had custom specs and ported housing or just alot of boost, most people i know of with vtec motors are only running about 7psi and thats on a t3/t4 turbo, making good power but its all in the efficiency of the turbo, put it this way, a t3/t4 turbo pushing 8 psi is like a t25 pushing 16(relatively speaking, you dsm guys, dont get all smart assy)and usually the housing of those turbos really hold back the flow and choke the motor, it just cant get rid of exhaust fast enough, but your si also has 30 more hp to start off with than my car but you cant really run the same amount of boost that i can safely because off compression i would stick with SHUT THE FUCK UPS ADVISE and get a t3/t4 turbo, and some injectors, id stick with my advise on the jackson racing fmu if your not going to get a hondata, his pricing was pretty much correct for new or used stuff, i would advise against a junkyard kit if your looking to make that much power, id also say to get hondata if your trying to go that much on a stock motor.....