I am flying an Imperial Clipper with a power distributor rated Class 6, Rating A, Mass 40.00T. Have I reached my limit as to how high I can go or have I just not found it yet (because I haven't found it yet) I have been to dozens of High Tech. stations but cant seem to better it.
If you have an A class module in a size 6 slot, there is no higher module available. If you have a size 6 in a size 7 slot, you have the option to upgrade further. The slot size is given in outfitting.
