any bugs that there were, such as the gas tank and diff shims(I don't know of any others off top of my head) have already been updated as running changes in the kits. If you receive a kit with old parts just email [email protected] and we'll get it worked out. So in other words, no updated nb48.2 as the kit is less than a year old but all kits have the updated parts now unless you got old stock from a retailer. The only reason there was an eb48.2 was because tekno wanted to make all the lightened upgrade parts stock pieces and kept the price the same instead of making everyone buy all the upgrades separately. All kits since have also included these lightened upgrade parts.