I'm just going to give you advice and a lesson i learned myself a long damn time ago.
Keep it stock and save your money! I know, i know but if you must, i repeat you better do your due diligence and find prior work done , pictures, video, references and even contact anyone who has had work done like this with them and see what they have to say.
Do not trust these shops at their word, do not pay them a single cent until you see the finished product and it is satisfactory, Perosnally again i just wouldn't f with your truck. There are so many hack shops out there and work like this, if not done correctly can ruin your truck. If Whipple has someone they recommend, drive to them imo!