Warranty

[thesolution]

Does slip on cans void the warranty on a new M659?

I have also read that no ECU tuning it needed for slip on's, true?

[zooom]

not sure what an M659 is...so no clue...so I think it best to consult your dealer....

[JEFF_H]

In the US aftermarket parts do not void a warranty unless they are the cause of the problem.

depends on the slip-ons. some are designed to run with stock ECU settings (with the baffles in)
there are performance advantages to tuning, but the bike may run fine without as well

[duccarlos]

Warranty laws are very specific to the countries. For instance in Chile the dealers provide a full warranty as long as all maintenance is done through the dealer. So they would only provide warranties if they install any mods.