To keep or get you out of trouble? Do you mean full as in including manifold downpipe and cat too?
Only reason I ask is I eventually want to replace my standard system from cat back and go for a dual exit stainless system but every year I look at mine expecting it to be s@3! and its always fine! LOL So if I did bring that forward then I would have my standard system spare to sell but it wouldnt include the cat, downpipe or manifold.
Other problem I cant really afford a new system yet as my wife is on maternity with no pay for next few months! So might be tricky to do soon!