We've had quite a few questions on the power difference between our case and a stock Zenoah case. Testing was done on our prostock g290rc we've been developing. We're seeing by just swapping to the TR/OBR billet piston port case more power all the way across the board. .2 ft/lbs of torque and HP, broader powerband, +1500 rpm's and quicker crankcase temperature dissipation. You're not going to bolt this case onto a stock engine and turn it into a full mod or anything but you will see a noticeable difference in power.