I got 408 to the ground with a smarty TST and a smaller set of injectors. I am still running the stock turbo and really need to upgrade but I may be upgrading trucks soon.
Jeff is right. I started with the Smarty then the TST and then I got injectors. I sold my TST awhile back cause I needs a little cash and I bought it used on ebay for 550 and sold it after having it for a few years for the same price. Be ready to swap clutches!!! I run a South Bend Dual disk...