he means a stock turbo from a different engine.
If you seek the same or better economy and are happy with the power, go back with an equivalent unit. I have played the turbo game on my TDI beetles.
With the VGT system, they spool great and have enough headroom for a moderate power increase if you choose to do so down the line.
Put in a bigger turbo and it will not be as responsive to small changes, and I took a ~3% hit when I went up to a hybrid 17/22, with the same tune.
I ended up going all out and lost probably 4~5%, or 2~3 MPG to gain seriously boatloads of power. Call it my 46 MPG midlife crisis
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears