It is not advisable. The riser on the Rirecat is cast magnesium and is not as strong as a machined aluminum riser would be. But a lot of people are doing it. So far we havn't heard of any risers braking. Use the Scepter cam charts. Don't do it if your bow has the old wood center xrg limbs. You must have the Coreflex straight or recurve limbs. Any cams listed for the Scepter can be put on the Firecat. Do a search on Firecat on hear and on Archery Talk.com. This is a start.
I started to do it to my Firecat and got talked out of it. Wish I had.
May All Of Your Arrows Find The Bulls Eye-MSMFSL
NRA Life Member
Scepter IV Elite w/Furious X Cams