Jolly Green Monster

Cooler throttle body, inlet manifold.

It may need an ecu reset. Usually a proper custom map is done to suit the fuel in the tank at the time

If your a fairly standard forester the yes the recommended by subaru grade oil is best. I would go fully synthetic

V3/4 are three pin.

If you haven't sorted to already its possible to get adapters to fit the 440cc phase 2 or v5 injectors into the earlier fuel rail :)

Water feed to throttle body - remove and loop together. Stops water temp warming the throttle body. It's the to stop it freezing mainly in extreme weather conditions.

Is the car modded? Decat for example. Making an assumption but the on off boost is possibly it over boosting and pulling the boost down and then back up etc. if it's Decat then then this is often the case. 3port won't help but you can lower the boost by altering the pill in the boost pipe size

I have seen good results with motul 300v 15w50 and millers 10w60. Plug wise upto 300ish hp ngk pfr6b over 300hp ngk pfr7b and beyond 550hp racing 8s. Varys depending on the year of the car but usually 0.6mm plug gaps if early car (v1/2) 0.7mm v3 onwards. Simon

The ESL daughter board would probably work out the best option. You can map it yourself if you wanted to tinker or plenty of us Esl dealers out there. If you wanted a modern processor and budget is a little higher then and Alcatek or syvecs are very good. Simon

You You Rang ;)

K&n works really well, if its a classic and you can find one the apexi also works well. Hks mushroom when mapped in does produce good power but it doesnt filter fine particles very well.

What year is the car Martin? The hks stuff is v expensive and the software only available to hks dealers and last time I asked they wanted 11k to be a hks dealer which I found a bit ridiculas as I didnt want to sell hks stuff

I agree the walbro does have a limited life. Ihave been using rcm340 and not seen any issues but then tbf not used them for two years yet to know their long term servicable use yet. A basic fitting guide is on my website in the help pages www.jollygreenmonster.co.uk

Was the car mapped on texaco? Its not a very good fuel. If it was mapped for say shell vpower the ecu will have detected knock and pulled timing and if bad boost as well. Try a decent fuel. Subaru engines like shell vpower, tesco 99 and if there is no other choice esso 97. Subaru engines really dont like bp fuel. I believe texaco get there fuel from bp for the super, well its very similar power wise.