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Had a 06 Sti myself for a few years.
imo, it's got great power stock.
maybe it's the added torque from the 2.5l, idk.
Never felt the need to even add an exhaust. & kept it entirely stock.
Moving from that to a stock evo x, the evo's a bit sluggish stock.
It def needed more power prob to keep up with the extra weight.
Still, I enjoy my evo overall much more than my old sti.
evo's 4b11 appears to be much more responsive to power making mods than the sti engine (ej25?).
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