FYI-You can make up a WI system for around $150, buying new parts. If you scrounge you can do it for less. A Devil's own pump is $100 new, a big nozzle from McMaster-Carr is $15, tubing and wires you can get at your local hardware store.

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment