I have a question about warranty when mounting for example mods and enhancements on the bike.

I have purchased Kevs O2 mod and fuel mod and a DNA filter and I got the local dealer to mount it when I had the bike in for a 20 k service last week. But they wouldnt do it at all in the first place and I had to do a lot of persuading to get them to do it. And they told me that the warranty would not be good any more, just forget the warranty if you mount that stuff on your bike they said...
They had a another bike similar bike (Tenere) in at the same time as mine with a strange noise from the engine and the owner of that bike had only replaced the air filter - but they claimed the warranty was gone on that bike just because of a replaced unoriginal air filter. And true enough - the bike was removed from the dealer without repair a few days later....

So is the warranty really gone now from my bike when Kevs O2 mod, fuel mod and a DNA filter is mounted?

Does this mods in any way affect of the "life span" of this kind of engine?

Excuse my bad English......

Regards from Snakeboy