it stacks great with a tst smarty bddl i have stacked it will all of them it is a great pressure box and i know some people have stacked with the tst and the smarty at the same time i never did but i didnt have the smarty when i had the tst on my truck. you can pm me an offer if interested
Let me look into it some, I know the TST/EZ/Smarty stack is a pretty amazing stack. Though I know a few guys run the timing to much and burn there motor.