Install it, tune it, and find out. Lol. One of my friends used it on his stock SC400 and tuned and got 10 more rwhp. I'm not a tuner, but I was told it's a bit tricky to tune it. You can either tune it only in open loop, or you can buy the o2 sensor simulators and tune it anyway you want it. The simulators tricks the sensor signals to think it's normal, so the stock ECU doesn't see the difference and adjust the timing and fuel back to the original map.