no i will set it straight for people that dont know

get rid off you aussie spec itr stuff it is shit enough said

the jdm b pipe is not he same lenght as the aus b pipe
the jdm b pipe is longer

if you want to upgrade to jdm spec items
and are tight on your budget
get jdm 4-1 headers 250-400 bucks
get a jdm cat 150 -200
this will bolt onto your existing jdm cat back
unless if it has been tampered with by a exhaust shop to fit your shit aussie itr headers
i bet it has been

dont say the toda headers are to dear the cost to go custom will add up close to what you want
labour getting flanges and etc will cost you in the long run

get the jdm 4-1 then SAVE for the toda headers

so what you will need to make your exhaust a bolt on job and you can do your self if you have some basic tools
any jdm header, jdm itr/ek9 2.5 " cat , and any jdm cat back exhaust
all are the same lenght and all are able to be bolted on to each other
so you can do it your self with the car on stands
dont forget to get a 2.5" donut flange for your headers

top of my head jdm cat is 30cm long oz one is 45cm long