Lotus helped fine tune the suspension, trying to take credit for that is well... something jezza would do (btw top gear is not a reliable source of information, it's an entertainment program and nothing more) Do you really think they car would lose 3 seconds if JIC magic or Tien was in charge of fine tuning?
You don't normally call a company to 'help' 'fine tune' anything, either they're involved in the design phase or it's a waste of time. A company like Nissan will not have enough specialists in performance vehicles field to retain that sort of capability. So what does the company do? Subcontract! The specialists uses the company parts bin and add their own components as required.
This isn't some dig at a particular nation or company, every single large car manufacturer does it including super car manufacturers. Quite a lot of them even pay these companies to purchase rivals cars, tear them down and benchmark them.
And the GTR "does what it does" because of Attesa-ETS, their self designed AWD system created in the late 80's.
Well done to them, they designed one part of the drive train in house.
Oh and the almighty Koenigsegg may have "their own" engine now, but it's based on a Ford engine. I guess that means the Koenigsegg is no longer a European car right?
Again, the Ford engine is the base that they tune. Koenigsegg is never going to have the production facilities to produce entire engines so they take a base block and rework most of the heads.
The only difference between the GT-R and the Koenigsegg is that the GT-R goes out the door with the block manufacturers name on while the Koenigsegg goes out with the tuners name. On that basis if you're accepting that the Koenigsegg is European then the Nissan is too.. (British actually but

)
Is it possible for a European to give faster cars respect? I hate viper's and 99% of american cars, but that's a damn fast car no matter how you slice it.
I am unashamedly from the British old school of engineering (think Lotus). For me a performance car should start with a light, stiff chassis and build up from there. It's actually more similar to aircraft design in many ways as quite a lot of the early sports car engineers in the UK trained in aerospace.
I'm not sure if that counts as 'European' or not but to my mind your ZR-1s and your Vipers just start from the wrong place in terms of design.