Stack questions

[deerslayer5253]

I have a 2001 f250 and I want to put stacks on it I already have the stacks but I need the pipe to connect them I am going the cheap rout because I am still in high school and have a baby on the way so I'm trying to save as much money as I can. I was wondering if exhaust duct made firewood stoves would be heavy enought or if there is anything cheaper than ordering a stack kit I could use. Thanks for the help