A stock block can do 300whp with 110+ octane racing gas and a huge turbo and proper tuning. Only a few Focus Zetecs have hit this number though. The rods and pistons are real weak but if detonation is kept under control some say the internals could do 400whp.
Some have done 250whp regularly on stock gas, but again you need a properly sized turbo and intercooler. The weak link, from what I hear are the main caps, but even those have done 300whp.
2000 Rio Red I4 Cougar
200whp & 210wtq at 9psi
254whp & 276wtq with NX 35shot
WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip
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