Changing anything on the bike, in this case (part of) the exhaust system, will, according to the stealer, void warranty.
Mounting different headers is in this respect the exact same as having the CAT removed.
However, if you do the latter then you'll only have some advantages, below:
- a little lighter
- freeer flow of exhaust hence less fuel consumption combined with more effective power of the engine
- lots cheaper than buying other parts/headers/why
What's not to like?
The CAT itself is the problem, not the headers (unless they contain the CAT).
Get rid of the CAT, end of woes plus a few benefits!