Dude. Wow. Ok first of all. Don't talk about street racing. That's not allowed here. Only morons street race.
Second of all. N/A FS-DE's? At best, dropping 15 grand into a worthless engine, you may, and I stress MAY see 160 whp. Even then, it's the same bloody motor that's in the MSP. The only differences being supporting pieces for the turbo. That's in. And you don't blow the block. You snap the rods. The block is cast iron. The rods are made of tin foil. Forged bottom end, the right turbo, proper tuning (key here) and not being an idiot about it, sure you can pull 300+ at the wheels. Kooldino has done that and more out of his MP3. Note... same block as every other FS-DE out there.
Now... your car, as is, keeping up with a GS-R. Dude... I have a GSR swapped Civic. Trust me, unless that dude is either teasing you, or not even trying. My Civic has and will pull on a stock MSP. I've done it before. Keep in mind, I also still have my Protege5.
Now... just doing head work... ok, I'd expect to see a max of 10 HP at the wheels. IF done right.