Does anyone know how to make side pipes that come through the rockers I saw a picture of one while I wouldn't like to do it that way I would just like to pick someone's brain

 

There is only one person here who has done it, you'll need to search the exhaust section but I'm pretty sure its' the "Boomtube thread"... The problem is you have to cut through the sub-frame support area which causes strucural issues. the only option is to go under which causes loss of ground clearance.