1150GS suspension and exhaust questions.

[AirForce]

I have a 2004 R1150GS and was wanting some input from others who have put aftermarket exhaust and cat eliminators on their bike. I'm thinking about going aftermarket and would like to know what problems you encountered with your swap to include running problems/mixture/etc.

Question #2. I've been told the GS Adventure shocks are longer than the standard GS. Question is, could you put Adventure shocks on the standard GS without having to swap any other parts?

Thanks!
AF in MO.