I wouldnt think of a ported TB until you ATLEAST get headers. Even then, I dont think youd see noticeable gains until you added headers + cam at the minimum. Some people might say itll help, but like Remerson said, youll lose low end torque for minimum higher RPM hp, definitely not worth it IMO.
Id say your money and invest in headers. They are showing about 20hp improvement over stock manifolds, much better bang for the buck.
2015 Camaro 2SS/RS/1LE