I ran both at the track back to back an the Smarty was 7 tenths faster than the BDDL loaded with crazy larry. With Smarty the truck is much smoother and has alot more lowend power it was 3 tenths faster 60'. If your not interested in racing your truck just wanting more power an mpg the Smarty still gets my vote an the customer service you get with the Smarty-Bob is second to none.