first check your states laws to make sure its legal to do that if this is a street driven truck.here your exhaust must exit behind the passengers compartment.stacks have to be so many inches above the cab and there is a noise level limit.im running 2 5" stacks on mine that meet all my states laws.still got a ticket for modified exhaust.went to court over it.they said if it isnt stock it wasnt legal.but the law does not state that.i got kinda lucky as i just had the truck inspected the day before i got the ticket by the same inspection station that the city uses to repair,tow and inspect thier police cars.if it was illegal i wouldnt have passed.
im not sure how to do it but it cant be too hard.
