The short answer is ” yes”. The Leopard has typically been run at 355lbs and at that weight compared to an x30 is competitive, just. Once you raise the weight to 365 the engine suffers and is no longer competitive. The 2014 supernats proved the point perfectly as you had the best drivers under the same conditions and the leopard was able to compete. Once the weight was changed to 365 the engine cannot. We tried for a couple of sessions in Phoenix this year and it was a lost cause. Its too bad really as the Leopard is a good engine if properly tuned and maintained.