Audi 80 Type 89 2.0 helpä!!!!

Hello everyone has a problem, I’m a straight bolt from the bend to the hosenpipe flushly torn off. how do I get the rest up best? what do I have to take care of if I want to unscrew the bend from the head. the nuts are pretty rusty. if a bolt leaves me the head has to think out. let me know, it’s damn important.