No replacement for displacement i think. Mine and daves rides are 2.5's and seem to develop larger torque easier but seem to fades as the rpm gets too high, downside is lower peak hp, but upside it the cars dont have to be whipped like a stray cat to access the power band, where the 2.0L's make higher peak HP but need to be spinning like a demon.. that is the key to small displacement engines anyways,high rpm. I think looking at the latest tech twinscroll stetup from a reputable source would be a good place to start! 257, zorst, flash 441nm at 4000rpm :P

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06 sti