exhaust
 

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"

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