so im thinking of putting stacks on my truck and my biggest concern is that rain (and since I live in Canada snow) will be getting in my exhaust and im just not sure how big of an issue this is and how to fix it. not sure if it makes a difference but I plan to use 8" slash cut tips.
thanks

 

yes the rain or snow will get into the stack, You can put a small can over the top of it or even get the flappers for them.

 

I also live in Canada and i have friends with stacks on their rigs and they haven't had a problem with rain or snow goin down in them that i know of. But your best bet would be to do what 97cummins said and get flappers or i've seen around on the internet stack covers (sleeves) that slide right onto the stack and cover the opening. just would have to remember to take them off before you go anywhere.