Clemens
The options are endless, study the construction of the car the areas you have access to easily and the areas you don't, I am happy to advise you further off forum but I would ask others not to respond to this it is not a subject that should be open to public access and if you mention what you have done on your car it could invalidate your insurance.
If any other member wants some suggestions please again contact me off forum I have pulled apart and put back together again 401's 408, 410,411 and 603 so should be able to help.
Geoff
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