5-10whp would not be that bad, especially if you can just change it in your existing UpRev tune. I also heard it could be like putting a mild cam in the car, some I'm sure it will help alot down low and add some much needed torque.
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2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness.
???Whp ???WTQ (Will find out come spring time)
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