Tidgy

you can sell em as a rolling shell, but wont have much value.

All good mate, have to have a proper catch up at some point. tbh i wouldnt bother then, if your going the full hog (good choice lad lol) then review it at that point, as they will need to be sized accordingly anyway. not sure its worth even doing the 43 either as your gonna wanna go bigger if your forging etc.

Not seen inside the boot of the newer forester, but my and my folks XV/crosstrek needs a special insert to hold the full size spare which also lifts the boot floor. For £700 i'd just stick with a space saver

Personally i've never bothered with it, I tend to find all 4 tend to go at the same sort of rate, as above bad alignment would prob be a more serious consideration than which wheel.

Summer tyres tend to have a fairly high cold point, around +5 degrees they start to have issues with reduced grip due to the rubber going hard, personally i wouldn't want to be driving round in winter in the uk as even in london temps drop below +5 and since its coming from a dealer i'd be asking for a suitable all season tyre to be fitted. I don't know what the official position of insurance companies would be on it if there was an accident and the temp was below that threshold?

Short version is yes, you can go too big, is it still running the stock engine? if so then gonna be touch and go how much you can push it and still retain reliability.

you tease,,,,, lol

For that sort of power exedy pink box, nice upgrade in capacity without getting grabby etc

Scoobyclinic - Chesterfield, everything from servicing to race car builds, Engine rebuilds, body work, suspension setups etc https://www.scoobyclinic.com/ Engine Tuner - Plymouth, engine specialist - https://enginetuner.co.uk/

What sort of power are you running? do you have any plans to increase it in the future?

tbh i think its more on the car itself, personally I'd prob lean older lower milage, but its really pot luck.

try importcarparts

Sounds like a boost control issue, best bet would be to get it to a specialist to have a look and diagnose.

def worth finding out the condition of it to see, now adays a decent ra shell is worth rebuilding, although not cheap, so prob find someone would takje it off your hands

have you checked out the throttle position sensor? what spark plugs went in it? Has it got fresh fuel in it? have you done an ecu reset?