I'll confess. I am half posting this to help assist in generating conversation in this community.
But I am genuinely curious: Is it worth it to change out coolers / power plants? I changed out my Taurus's quantum drive and it was hugely helpful, so I'm kind of exploring what other upgrades I could make.
What component upgrades have you tried? Were they helpful or noticable?
For the most part right now, the only difference between power plants or coolers is the amount of power/cooling they provide, and as long as you're providing enough for the rest of the build, having excess doesn't help. Most of the time, the stock power plant and coolers are fine. But some ships like the 350r for example, are pushing the stock power plant to it's limit with the stock configuration, so if you replace the ballistic weapon with laser, the power needs are suddenly too much and you'll need to upgrade the power plant. This website: https://www.erkul.games/live/calculator will show you whether you need to upgrade the power plant or coolers. If you do need to upgrade the power plant or coolers, Military Grade A is a popular choice since it's high performance and has high component HP, and it doesn't have a lot of downsides like it used to when stealth was a factor.
I've also noticed that seeing the power to "stealth" reduces the overall power available to some fraction of what the power plant provides, sometimes reducing a bit to low... I haven't tried it, but i would expect a better power supply to be able to be used in stealth mode (reducing power signature) all the time.
I don't know how much it has an effect on stealth, but it's worth noting!
Also, stealth power supply can power up faster: you can fly "in the dark" until the moment to strike!
Have you tested lately with a friend to see if your detectible range changes when you click the stealth button? I was told that button doesn't really do anything anymore but haven't tested it in a long time. That's good to know about the stealth power supplies powering up faster. I hadn't thought about powering the whole ship down to be more stealthy and then powering back up quickly to strike. That's a cool idea. I was thinking about getting a Razor EX or something for those times I want to scout a pvp area without being detected, so I'll consider that when upgrading the components.
You can actually see how detectable you are if you go into your Game Settings, scroll all the way to the bottom, and enable "Emissions HUD - Display Signature Values"
It doesn't tell you the exact distance you're detectable from (since this can depend on the sensors/sensitivity of the ship trying to detect you). But you should be able to tell if it makes a difference or not.
Plus one for the erkul.games shoutout - that site has saved my bacon more times than I care to admit! Such a useful tool for ship loadouts and pricing info :)