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Originally Posted by Malt
The "gains" you felt were most likely induced by the fact that you want there to be gains and the exhaust is louder so it must be better..
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I hate the butt dyno posts. Bullshit. He's not feeling butt dyno effect, he's feeling a real increase of power, but with a tune he'll feel more. When you go catless you will get an increase of about 5% power output from your engine. But that's it. And yes, anyone will feel 10 HP. Once he gets a tune he'll double that extra power.
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Originally Posted by dsport mag website
The 5-Percent Rule
Because the ECU in the Scion FR-S has tables built in that essentially limit the amount of additional power that can be made, dyno testing bolt-on products on the vehicle proved extremely challenging. Based on over 250 dyno runs that we conducted, we found that the ECU seems to only allow performance gains on the order of about 5.0 percent. Adding the additional components to allow more additional power production with the factory-programmed ECU still only delivers that 5.0 percent gain.
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