Unless it is 7sp DSG (s tronic) in Q5, which can handle 500Nm torque and is for longitudinal mounting (and which reliability is yet to be seen), than 7sp DSG like in Golf and Polo is very limited in how much torque it can handle. So, 4sp auto from Subaru is probably stronger transmission. As you start putting more gears in the transmission than you need more room inside to accommodate the extra gears and longer shafts, so the transmission gets bigger or weaker - hence 7sp DSG for less than 300Nm torque. Tiguan has 6sp auto tiptronic transmission, so it's not a DSG. When it has diesel engine the max torque is 320Nm, petrol has 280Nm torque. Please note the absence of the 125kW diesel and both petrol engines 125 and 147kW have the same torque 280Nm.
Here is the link to detailed description of the new forester with diesel engine. It has 6sp gearbox.
http://digiads.com.au/car-news/lates...el_200809.html
P.S. Even petrol version of Forester XT gives you more performance in 180kg lighter body. (from subaru website) "Underneath the distinctive bonnet scoop you’ll discover the powerful Boxer engine capable of producing 169 kW of power at 5,200 rpm and 320 Nm of torque at 2,800 rpm"
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