It all depends on the sound that you like. I've had a 1G DSM, TurboXS Type H and TurboXS type H RFL. my fav was the type H, second was the DSM, and the one that i hated the most was the RFL. I would rather have a "wooooshhhhh" then a "PSSSHHHTTTT"
for those of you running the 1g DSM.. put some sort of filter on it, they are openin when you're in Vac.
I'm not pulling this stuff out of my butt, I'm young but i kinda know what i'm talking about with these things... i've run them all on my minivan.