Originally Posted by 05WRXRally
So all i need are th 2.5 block w/ internals and the stock heads, will i need a new PCM or can i use the STi cobb ap? And what turbo should i look into for getting around 350 whp? As for the tranny, should i just go with a set of new gears? Thanks for all the input, ive definatly trashed the H6 idea. just thought i could get some seriouse HP but not withought selling my soul... why do the STi blocks love that WRX heads, why didnt they just put them on the STi to begin with? I would imagine they give good backpressure for more torque but that might just be with V8's ### thats what im use to workin on
Jave is correct on the AP, if you have one now your set, just get retuned for the extra CCs and fuel..
As for the WRX heads on the STI Block, not sure why it works, but it does a lot.. There are a TON of guys running this setup well.. As for the STI heads, they are AVS.. There is an oil line that feeds into the heads and the oil pressure actually can adjust the valve timing at lower RPMs to aid in turbo spooling which makes them spool faster.. That is why they don't come with WRX heads..
As for the Transmission I would suggest a PPG Gearset for your stock housing.. AndrewTech Automotive has the maket and is a great company.. I broke a shift rail (Don't ask me how) and he fixed it for FREE... You can get a 1-4 setup for around 5gs..
Definitly dump the H6 idea, I did as well.. Too much work and money for the outcome..
As for the turbo.. There are SOOO many to chose from, Any thing that is Dual Ball Bearing like the GT30R...
All you need..
STI Short block (comes with block, Crank, Rods, + Pistons..)
New Gasket Set
Really that's it.. It can be done for les then $2,500...