So, I've been doing some research and I`m really stuck on which motor and other components are best for my 03 2.5 RS all tips and suggestions will be EXTREMELY helpful and looked into carefully!
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And no Subaru 5 speed will hold the power when you're pushing it, so you need an STI 6 speed.
Used JDM Subaru Legacy Spec B TY856WBDAA 6MT Non DCCD Transmission with 3.90 Final Drive. JDM Subaru Forester WRX STI 2.0L Turbo 6 Speed Manual Transmission Rear Diff. Dallas JDM Motors. 6 Speed Manual Transmission.
Clutch kit to hold big power: $750+++
Sti wiring harness $several hundred
Having Iwire or another company merge your wiring with the STI's: $1500+
You probably want to stop, so a set of brembos, quality pads and rotors: $1200+
Wheels and quality tires that clear your brakes $$$
Fluids, timing belt, gaskets, sensors, misc parts, etc. Easily $1000, could be significantly higher
Estimate your car will be down for a few months.
And so on. What I'm trying to illustrate is you can very quickly exceed the cost of an 04-07 STI, and still have a car that you can't sell for anywhere close to the money you put in.
Don't get discouraged, but just know that financially it may make more sense to start with a factory turbo charged car and build that up.
For example, in my area (Greater Seattle area) there are always WRX's needing an engine or trans or both, for $2k-$4k. Hell my friend just tried to offload his running and driving WRX 5-speed wagon (rough body) on me for $2500. I just don't need 3 turbocharged Subarus lol.
My favorite engine is the ej22. You can take an old 2.2 block and put turbo heads on it for a super cheap, decently fast motor. I ran 18 psi on a 2.2 block with 2.5 heads that I modded for turbo oil return, it was all old 90's non turbo stuff. If I had put a new oil pickup in it I'd still be running it today.
That's probably about the limit for that setup, but cost/power ratio can't be beat. If you have loot get the aforementioned ej207.
Have you considered engine management?