Dav 27

hello , ive just purchased a 94 wrx , and its just startedto play up , when i give it hard on the gas it feels rather jerky as though its holding back ,when i got the car i found out it was running at 17.5 psi with a supachip , pressure regulator dump valve etc , the problem is i havent got a clue what to do as ive no manuals for it or botall, and the problem has just started to happen , and also noticed that my car dosnt half redline quick but i know this is not the problem as the fault happens 3 4 grand revshard down ,and is 17.5 psi to high or what if so how do i adjust it by the pressure regulator or does everyone think i should just get it tuned ,i used to know abit about turbos etc but when i lifted me bonnet i put it back down ,looked abit complex than the maestro turbo