@Niko169 as @kershaw-330s says start with simple mods first,something like a cosworth panel filter or perrin,then look at exhausts,most people go with 3" piping on exhaust but 2.5" pipe is just as good and can cope with upto 350bhp with no problem I was told by cobra exhaust.you wont really see any power gains with the 2 mods until you have it remap't,i would think about upgrading fuel pump before a remap and do your research on who your going to let map it,dont just let anyone because they are close do it,as said a good 280 remap will be much better then a 300 bad remap,also if it done by a cowboy your just going get problems further down the road.you said the car has great servive history but I always give my cars a oil change as soon as I get them,good service history or not,use good oil and a genuine Subaru black oil filter,dont put crap supermarket fuel in it either,its not good for them,use shell vpower if theirs one near you,use crap oil and petrol then expect engine problems.i have just noticed your in Rotherham,if you fancy a drive I live in wombwell your welcome to drop by and give you some pointers.