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Obbzi, you'll find that the well established tuners take DSG into account. It's not more difficult but more the importance of limiting the maximum torque which the DSG box of tricks has to handle. This is done as a protective measure - Afterall, any tuner who ignored this and it consequently resulted in expensively broken DSG boxes, would very quickly be avoided and would find it difficult to stay in business.
I guess that if your quest is maximum power, then you might choose a Manual transmission but personally I think that driveability and reliability is more important. The Ed30 obviously has more potential for maximum tuning but uses the same DSG box (unless T_T corrects me!). The GTI/Ed30 is also a FWD (obvious statement of the month!!) and balance should also be a consideration. At least, that's my opinion.
The unwritten rule seems to be a safe max torque of about 300 ft lb / 400 Nm for DSG. It'll doubtless take more but the more you push the envelope the more risk of problems.
