I installed this piston in an 07 RMZ-250 after I just put an OE piston in 2 months earlier. Only did it to try and get more power (more of an experiment than anything). This Piston absolutely rocks, it has more power more torque, amazingly its easier to use the power thats there too. Installation was the same as any piston but the PC piston slid into the cylinder easier than the OE I thought. I have zero complaints on it. I am running supreme pump gas and it works great no pinging or misfiring. I did not mark any stars for durability because I only has a month or so of riding on it, however it seems to be just fine. For the tech guys when I measured the stock piston before installation it was 76.96mm and the PC piston was 76.98.