Well hell yes the compression goes up! with that dam thing out of the crankcase the Ozone levels inside go down which helps aid ring seal (had to think about that for a while!) It also makes the oil viscosity drop about 10 points, so more gets past the ring gaps advancing the timing, so yeah it'll make it kick back a little. You may even experience a little less magnetic draw on the connecting rod too, so there could be as much as .2% horsepower increase:thumbsup: