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Torque has nothing to do with the configuration of the engine. It is a function of the bore:stroke relationship, cam profile, intake tuning, and exhaust. Look at the M3 inline six. It makes nothing down low. We could build a screamer over-square inline six that made no power below 5000rpm, or an undersquare torque monster that could tow a Kenworth at idle.
The inline six has an inherent balance that the V-6 does not thanks to crankshaft weighting and firing. The boxer six and the inline six have the right relationship between firings and rotation in space. The V-6 engine does not, but balance shafts (not to be confused with crank weights) can offset some of it. MB's M112 V-6's are pretty smooth puppies.
Produding a V-6 engine is not any less expensive than an inline six. The main reason for producing one is packaging space. It is possible to lower hood lines dramatically. The packaging aspect is the number one reason the V-6 is so prevalent. FWD packaging made the straight six a rare bird.
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