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Hi every 1 im new to this infact its my 1st post,i have recently bought a wrx on a 02 plate and looking at playing with it a bit,i have never owned a scooby b4 but now i bought 1 i love it ,i never understood why people messed about with engines but now i totally understand ,anyway i have no idea what im doing but im gonna give it a go so far i have had new lights fitted which looks nice but i want to increase the bhp so far i have only added a induction kit which seems to have made a little bit of differance and i have been told the next thing to go 4 is a exhaust so i need a little help choosing 1 i have looked at the afterburner and 4 the full system its a round 500 quid is this the right way to go and they say it will give u around 20 bhp is this right and if so is that noticable {i did say im new to all this car stuff}then after that prob get it chipped and remapped am i doing this engine thing right please help