thinner ring sets are lower in drag yes. the important thing is to use a very good piston. this is because it is what keeps the rings seated "squarely" aginst the cyl. walls with all your new found pressure! good ring lands and a tight clearance and round cylinders will keep things from leaking. je makes a hardend ring set for nitrous and a great piston . I am biased to the mahle brand products myself. ditto on std. tension oil rings. and pleanty of end gaps...