Get the tuner you will spend more but it will be worth it. I got my JLT from BAMA chips... Great company to work with. Came with three custom tunes (your choice) in the Xcal.
http://www.bamachips.com/store/index.php?main_page=product_info&products_id=16&zenid=d7970937cf905627727bdaf70c792e4e