ATS 3.6 Performance upgrades/Shops

Hi all,

I have a 2013 ATS 3.6 AWD that ive owned for two years. I have been contemplating doing some more upgrades to get some more power out of this engine. Ive already installed a CAI and a Magnaflow exhaust, but besides that idk where to go next. I was looking for shops that would know what to do with this car but I haven't got anywhere searching on my own. I was wondering if anyone has a suggestions for any other upgrades or a Tuner shop in the MA area.

thanks in advance