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Hi All, I am reaching out for help as I have a 2002 Rev D. model BE5 legacy (originally EJ204 N/A) which I have recently swapped to all Rev A. EJ208 running gear everything including all wiring has been swapped in the engine cranks over just fine and does sound rather hopeful however I am aware there are a myriad of CEL codes regarding the fact there is no other turbo as I have a single scroll single turbo setup. I am really hoping someone may have the experience with this what i would've thought to be a simple swap I'm sure someone has done this before and can help. I'm not sure how to decipher the engine codes to find out whether it could be a problematic sensor or if it may be something entirely different. All input would be greatly appreciated my instagram handle is also the same as my subclub handle if you are located in auckland and would be happy to come have a look for yourself my responses will be much more timely over there however ill keep up with this thread i've started. Thanks everyone in advance, Gary.

Only help I would be would to ask if you've read the FAQ's on here : specifically along the lines of these threads : Some of those are 10+ years old now & there have been a few advances in the ability to "Tune" the ECU since then too eh

What ECU are you using? The Rev-A Engine will have a differnt crank trigger pattern so you might have to swap that also. Here are the diffrences in old generation vs newer MY01 crank and cam triggers - in your scenario if you have somehow installed a Rev-D Twin Turbo ECU then you will likely only need to change the crank trigger, cams will be the same between Rev-A and D IIRC

Has anyone tried this cooling mod? Besides Dom’s post I've yet to find any real data from others proving it actually has done what it should do. It basically just allows coolant to exit the head at the back which promotes flow around cylinder 4 which ’apparently’ tends to stagnate a bit with the normal routing. There doesn't seem to be much of a downside other than reducing flow through the heater core which isn't a huge biggy round these ways. Kinda keen to give it a go on the new motor since it'll be super easy to do before putting it in. Obviously I'll make up my own kit rather than pay 80+USD for a small length of hose, T, bung and a few clamps. https://www.iagperformance.com/GDT-Cylinder-4-Chamber-Cooling-System-WRX-STI-p/gdt-1005.htm

We have them in stock (not Dom ones but same same) https://www.mlracing.co.nz/torque-solution-cylinder-4-coolant-mod-subaru-ej.html