I think think you are right, this recall mod should reduce the heat even farther. I am thinking about mounting a fan somewhere in the engine compartment that I can turn on manually to pull heat out at low speed or in stop and go traffic. Any thoughts on this and on where to mount the fan?
I have done both of these mods as well. You should NOT have to re-install them. I agree that both of these mods together have mad a huge difference in the amount of heat coming up around the seat, as well as the heat on the fuel tank. Whatever ECM changes are part of this campaign should be compatible with both of these changes. They have had no effect on the ECM thus far, as you know. To the best of my knowledge, the only exhaust sensors that the ECM monitors are the oxygen probes up at the front of the headers near cylinders. Since nothing in the exhaust system is monitored aft of that point the ECM should be oblivious to both wrapped headers and the cat bypass.
I think that those of us who have already wrapped the headers and removed the cat, should have the best of both worlds after the fix is done. The Spyder should exhibit even less heat than those without the mods, PLUS, as has been stated earlier in this thread, BRP may even reimburse us something, through a dealer credit, for the previous work.