Hey guys i'm new to the subaru world and need some advice on which is the best route to go. I have a 03 WRX that needs a motor rebuild. I have been searching different forums for info and have come up with a few options but need to make a decision on which would be the best route to go. Whichever route I take, I will go with forged internals to handle my power goals down the road.
Option #1 rebuild 2.0 with good rods/pistons arp head studs etc.
Option #2 2.2 closed deck shortblock with forged internals, still not 100% positive what all I would have to modify to make this work in my car
Option #3 2.5 hybrid with forged internals and 2.0 heads, if I go this route I know I want a closed deck block but not sure which cars are the ones to look for a donor block from
Option #4 go with a 2.5 STI engine and upgrade the pistons.
Out of the options listed what would be the most reliable and cost effective route to go? The reason the 2.2 is listed is I found a 2.2 turbo motor here locally that already has forged internals but has a spun rod bearing for $900 that is a little cheaper than buying the 2.0 forged rods/pistons and I would be doing the same machine work to that motor as I would to the stock 2.0. Any info is greatly appreciated.