I don't think a dual sequential turbo setup works. Reason being is once the bigger turbo starts to spool the smaller won't be able to hold the same boost the bigger turbo is putting out. Ie. Larg turbo tops out at 25 psi and the smaller one tops out at 15.qwiksilvertrav said:Well on a 4 cyl it's almost plain stupid to have 2 turbos...as in one turbo per 2 cyl like a twin v6 setup. BUT, I've heard that on a 4 cyl, when you put on a HUGE turbo that requires a lot of exhaust flow to spool up, that you can get a smaller turbo to spool up the bigger turbo faster. I've never actually seen this setup before though but it sounds like it makes sense. My .02 anyhow.