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It all depends on your slab..

If you can saw cleanly through (4-6"), the hilti will quickly snap the cutout into manageable pieces.

If your saw cut's a little shy, you'll end up pulverizing to get it out. Then I'd rent a big electric.

I've done a LOT of this with my ts400 stihl and a te76 (i think). I've even put duct work under a slab this way:shutup:

edit: IMO Hilti makes the best electric rotary hammers.:thumbup:
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