Frans,
You left out that super effective exhaust system. Are the suspension coils not shortened?
What front anti roll bar are you using?
I know your list is just the obvious basics, because I know there are many more detailed mods involved, some are: window glass-to- perspex lightening
plus other body lightening, negative camber inducing off-centre bushes, shorter rear axle limit straps(chains), etc, etc. I think it will take a long time to recall / record all the not so obvious mods, some of which have taken considerable thought and effort to apply. And I think it's great!
Henry