I've been playing the game since the MAC version came along – May time I think. I've been bumbling around having some fun and I'm currently using a Cobra which has A4 Power Plant, Thrusters, FSD and Shield Generator. A3 Power Distributor and Life Support and a motley selection of other stuff. My question is about further upgrades. I cannot find any modules better than A4. I've done all the things about looking in High Tech, Highly Populated systems but to no avail. Are there limits to the class and rating that can be fitted to a Cobra or am I just not looking hard enough?
Yes, there are limits. The outfitting screen tells you which size can be fitted into the corresponding slot. The numbers indicate the size, 1 being the smallest and 8 the largest and the letter determines the quality from E (worst) to A (best).
So for example, the slot that is named frame shift housing shows a 4 in the outfitting screen which means a size 4 is the largest FSD you can fit. The slot named power coupling shows a 3 so you can only fit a size 3 power distributor. You can always go smaller but not bigger. The Cobra has three size 4 internal compartements, for things like shield generator, fuel scoop etc. So you could install a size 1, 2, 3, or 4 fuel scoop for example.
Check out coriolis.io, there it shows what can be fitted into what slot. Hope that helps.