I've currently got a TST Powermax1 box on my 2000 4x4. It doesn't seem to smoke anymore than stock, but it definitely picked up power. I'm about to stack it with a Diablo Power Puck which should add some timing in down low like the EZ would. Will added timing add anymore smoke? I don't want to put on a constant smoke show, but I'd like to be able to put out a little for those pesky morons that run 55 on the interstate. 
