Termigioni 45/50 full exhaust Monster S4

Rearcylinder header split to both silencers

The headers pipe coming from the cylinder head

Front header split to both silencers inside from inside and outside

The outside actually looks nice. The next question is the port size. Inlet to the headers are 29mm and the actual port is 27mm. Is this like it should be or is it maybe a good idee to open up the exhaust ports to 29mm?