Has anyone used them? If so, do they really work? Could they be a simpler alternative to VNT/VGT for those of us who cannot make controllers for VNT/VGT?

http://www.spracingonline.com/store/Sound_Performance_Quick_Spool_Valve/3659

You will need the following in order for this valve to work
- Undivided exhaust manifold
- Divided exhaust housing on your turbo

Where do you get a divided exhaust housing for your turbo?

I am planing to buy a new turbo one with T3-divided exhaust intake. If you already have an undivided turbo you may be able to find divided turbo housing on e-bay.

A VGT is just as simple and will give better performance for the same cost or less

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

That was going to be my comment, you can probably buy a used VNT off a sprinter for less than that.

If some one trys the valve in the link they should take a Center Punce and punch the exposed threads on the screws that retain the Butter Fly Valve so they will not vibrate out.

Also the Valve looks rather frail.

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84 300D, 82 Volvo 244Gl Diesel