Hi just thought I would say hi as Iv just bought my first Subaru Impreza it's only a 99 uk 2000 running about 250bhp well that's what the previous owner said, i also signed up as I haven't got a clue about these cars except there nothing like Iv driven before so hi 

Welcome , best off checking who mapped it to start ! Welcome to the danger zone 

How do I check if it's remapped and where is the ecu located and you will be getting a lot of stupid questions from me has I haven't a clue about these cars 

Wotcha and welcome - ECU located passenger foot well, check this thread for lots of info currently being discussed

and this thread for things to do if you get bored

 

Got a receipt for a map might be a good start 

 

or if it's a sp Ecu ( has a sticker ) 

Right I looked under the plate where the ecu is and all it says on it is v5 so does that mean anything to anyone and can I swap that out for a better one 

ifs its been remapped to run 250 bhp you will have a ecutek license 

 

only way to tell is to take it to a ecutek mapper , 

matt is right, to get 250bhp out of 99 2000 it would have been remapped. v5 is a standard ecu which as matt said can be remapped if you had a license, did the seller provide any receipts that would state payment for ecutek license and did he provice a dyno sheet.

Or even worse heaven forbid install a boost controller (manual one)

It's already got a manual boost controller running between 14-15 psi 

Oh I would go see a professional asap

Do you know anywhere in Kent area that could help me out then 

Where in Kent are you?

Gravesend 

Not far from me. I'm up near bluewater. There is a place in Canterbury called East Kent Subaru. He's a respected breaker but quite knowledgeable. For mapping I used Duncan Graham @racedynamix. He visits eks onelce a month too.

Cheers I will take a look and have a drive up there in a couple of weeks