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Would this remap increase performance of the Ppp further?

Thanks fr help so far. Will start with a post bad weather polish. Then I need to find somewhere around Newcastle that can quote and do that kind of work - do you think I will really notiice the performance difference ie acceleration ? Also what does white line mean ? Thanks again

Have recently considered selling my 06 wrx ppp 265bhp with 55k on clock - think I started to get bored with it. Decided I should embark on upgrading it instead but have no idea where to start. Would ideally like more power although not much perhaps 300bhp ish. Can't spend thousands. Where can I go for safe reliable trustworthy help in Newcastle?