You should see what kind of power you can make with what you have first with the FlashPro. You'll be surprised the power you'll make with a real tuning device. I predicting at least 300whp for you with what you have. I'm just gonna upgrade to the Full-Race GReddy turbo and tune with FlashPro on my GReddy kit. I should make close to 400whp with just that. I can't wait!!I'm going to be selling my TSI kit when i get back from the desert and piece together a sweet custom build. Its about time we had something for our Si's.