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Toyobaru pretty much did everything possible to get the most power out of a NA 2 liter. Headers, Direct & Multi-port injection, DOHC, heck they just designed the dang thing. So at this point, there isn't much you can do. Honda got 240hp out of their S2000 but there is less friction in a Inline 4 than a flat 4 and Honda has a secret weapon. VTECH.
So basically its go boost or go home, companys try everything to get out of warranty anyhow. If they see you put a different screw in somewhere they could try and wiggle out of it. Just leave it until warranty is gone like the rest of us, it won't be to long.
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