I live in Denmark, and I got a Ek4 hatch.

I just got some parts from Japan. I got a JDM ITR header, and a 5zigen pro racer exhaust.

Now the exhaust did not fit the car because a JDM exhaust is much longer then a US / EUR version (they run a much shorter CAT in japan). So I went and got the ITR header and a 2.5" universal magnaflow Catalyst converter.

I need to weld some flangs onto the CAT. Do anyone know how long the CAT needs to be to fit in between a JDM exhaust and a ITR header???