Is this correct?

[Acoris]

Hi,
We change the whole exhaust but i have feeling below picture is not correct. Should i force it more?
Its the connection to cat

 

[MattInARedMicra]

Do you have any way to detect if it's leaking gases?

A blowing exhaust usually sounds quite distinct so if you can't hear it while it's running at high idle it's probably ok but better to be sure with emissions and everything

 

[.Maarten]

Looks good. It needs a while and some heat to settle with the gasket.