The abridged version: rod knock on my '05 WRX w/ 2.0L (stage 2 Cobb OTS map) = 2.5L hybrid build. Machines Gone Wild in Kendal did the build. 319.50hp, 293.90 torque at 16 PSI (very conservative tune).
2.5L Hybrid setup
Cosworth Head Gaskets
DW 650cc injectors
Blouch 18g 8cm
Cobb Intake w/airbox
New stock parts: clutch disc, timing belt, oil pump, v-belt, accessory belt, water pump
Gauges: AEM UEGO (wideband A/F), oil pressure, boost
Edit: Newest Tune and info Below....
Got a retune and the only changes are as follows:
NGK Iridium Spark Plugs (one step colder)
STi Oil Pan w/KillerB Oil Pickup
More Boost (was 16PSI, now 19PSI)
Old dyno results: 318.85whp, 288.37trq (16PSI, Temp: 87.90F, 41% humidity)
Current/New: 332.47whp, 338.78trq (19PSI, Temp: 97.37F, 28% humidity)
Both were on the same DynoJet and done by the same tuner, who also built my block (Gregg of Machines Gone Wild). The car has almost 85K miles and the block has 24K.