about 10 HP and 10 RWTQ with 92-93 octane. Custom burning for just CAI and exhaust is a waste of money unless you are doing gears also. On reg gas and no real engine mods I guess 2 to 5 HP would be about tops with a chip. The benefits of a chip come with premium fuel, firmer shifts, removal of the speed limiter and raise the RPM limiter and with a 99+ stang you get a speedo correction with gear changes.