I am purchasing a header with a 2.5 inch collector, howeva i have got a catback system with a 2.25 inch diameter, what is the best way to merge the 2 pipes i.e 2.5 header into 2.5 cat into 2.5 to 2.25 reducer into 2.25 system?

Is this how its normally done?

I dont want to run a 2.5 system as i believe it is too big for my engine(b16a)
Advice much appreciated