I have a question, my headers came in and i wanted to know if i should install them right now, with cats... but i have to wait to get tuned until monday. Will i be okay without the tune during the weekend? or should i wait until monday?

 

you will be fine

 

the only time when tuneing needs to be done asap is a cam swap or injector swap. Als maybe heads with higher cr. Anyway, you'll be fine till monday.