A downpipe and tune should get you more than what you're looking for. It's what I did and I'm happy with the butt dyno. If you can/are willing to deal with ethanol, I would recommend that as well. As others have stated, a tune is required to see any gains in hp or torque.
I will also say that doing high-speed/highway pulls is known to kill the LTG motor. Really any direct injection turbo motor will suffer from the same fate.
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