Import permit Mexico for bike that you don't own

[Gertmans]

Hey,

In two months or so we'll be crossing the mex border from the US. I've been doing some reading up here on this temporary permit sticker that seems to be valid for six months and doesn't cost a whole lot. The thing is we'll be on two KTM's that we don't own as they're press bikes. Should we expect trouble at the border for that or do you who've gone there before think the officials won't even notice or ask?

Thanks

PS. of course we'll bring some letters from KTM saying that we are rightfully riding the bikes.