As earlier mentioned, the original 2cv engine has a HUGE air filter. After some surfing, I found this open air filter which - after some "Dremel" modifications -fitted. It will stick out through the bonnet, so I need to make a good "scoop" for it.
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Made a start with the bonnet hinges as well..
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Also had to cut and re-weld the exhaust as it was touching the wheel in full lock position.