Putting a slip-on on a full system (Exhaust Question)

[Hi-T]

So the real question is can exhausts fail- do they wear out over time?  With my recent issues, I'm wondering if my Vance and hines is too old or has been dropped one too many times...

But the unreal question is:  Since I have a full system and the headers seem to be fine,  Can I just add a slip on and keep the same performance?

Also, what would I be risking or loosing if I used a slipon from a 600 (gsxr, cbr, r6)??

[dgyver]

The packing in aftermarket exhausts will need to be replaced after some time.