The KB has the absolute highest flow restriction of any intercooler. An optimistic flow number with that pump is 4gpm.
Plug and play, no. You will need to do some work on mounting and wiring them in.
The 13' GT500 pump will get you about 7gpm. The Stewart 8gpm. They increase substantially by percentage. But where you end up is still dismally slow for water speed. You won't need a partial bypass at flow rates that low.
It needs one, but barely.
That person also believes the Earth is flat. You can't move the water too fast. Period, end of story. Anyone says that you can is talking from a position of complete ignorance.
Every time we increase flow rate the performance increases. We have tested all the way up to 56gpm.
The Bugatti Chiron moves 200gpm. That car will go WOT for 9min without having temp issues (it runs out of gas at 9min). It's the only car on the planet that can do that. It's safe to say the Bugatti engineers didn't overcome the massive design hurdles to run 200gpm because they had extra time/money and did it because it would be fun.
Your questions aren't stupid. But, you can ask questions of stupid people. And get the wrong answers.