[b18c ya]

Will it add a decent amount of power?
My check engine light will come on right?
If it does, I saw a device you can wire into to O2 sensor to trick the ECU so you won't have a check light. Would this mess up the A/F ratio reading on my guage?

 

[cspina]

Wire the O2 sensor somewhere above the cat location and you should be fine, mine is and I don't throw a check engine light...