^^Not off the shelf for 4.6iS dude - for the M54 yes you're correct ESS is basically bolt on.

I'm dying to know if the TS for the 650 and 550 will work on a 4.8is. I know, I know, it's not listed. But you just know they'd do it if we asked. :cool:

Right? !ouch:

No one was interested when I was searching. I found sources that would do a custom supercharger setup but the benefit was not worth the cost. Same was true of twin turbos. IMO, meth injection and nitrous is by far the best route even when there is an off the shelf supercharger or turbo kit.