exhaust

[scooby999]

I have a 3" exhaust system from the cat back to tailpipe and I am thinking of changing it to a 2.5 system(I need a quieter system as the neighbours arent happy at 6:00 am)
What i need to know is ,i take the exit at the cat is 2.5,so is it just a case of replacing the centre section and back box or could i just replace the back box.
My theory is there seems to be more secondhand 2.5 systems than 3"

[asperformance]

do you mean you still have the std cat fitted?? then yes just bolts on as long as a std fit.........