Welcome to CHR Sherlock!
As Roger has already suggested, 3” would be way too much exhaust for this engine. I also appreciate that parts’ are not as readily available in Denmark as they are here in the United States. We also do not know what kind of car you have or how much money you want to invest. If you have a small car like a Nova or Camaro and say 1,500 Euros we can help you build a respectable engine that will sound great and run strong. If you have an Impala or a big Buick, we’ll need more money for the same type of experience!

Can you tell us a bit more about what you have and what your goal is? What car do you have, what is the budget and what is your goal? Do you want to go fast or cruise in a daily driver.

Best,
Glenn