Most of us here with 03 2.4s have exhausts that are blowing (unless they've already been fixed). It's just an age thing. Where one pipe becomes two, the two pipes go off to either side of the car and the metal thins around the bends as it's naturally thinner metal there due to the bending process during manufacturing. The exhaust on the 2.4 is only 2 pieces from the cat backwards, so Honda will not confidently patch it up and ask for £700-£800 to replace the exhaust.
I've been quoted £400 for a 2.5" stainless steel cat-back exhaust custom made for me. The tourer and saloon exhausts are different so off the shelf after-market parts aren't an option as tuning companies don't tend to manufacture for tourers. So speak to a custom exhaust place and see what they can do for you if your exhaust is going to become a bigger issue.