The cranks in the Puma's are a little cheaper. Depending on how big the Puma motor is, guys have been modding there old pipes with a larger stinger, so you dont have to buy a pipe.... Really thats it, the cylinder kit is a little cheaper then saber as well. From what we have seen so far the 431cc Pumas are within 1-2 hp of the sabers.....In some cases more HP then the sabers....