Cobb Tuning out of TX has apparently cracked the 981 ECM and come up with software mods for higher HP/TQ.
The price isn't exactly cheap--$1300--and the gains are modest --5-8%--on 93 octane gas, mostly at engine speeds above 4K.
Cobb is big with makes running turbo motors (Subie, BMW) and their entry now makes me wonder if they are getting ready for Porsche's full line of turbo models next year.
BTW, in the efforts of full disclosure, I have no affiliation with this company.
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www.cobbtuning.com]