hi ppl i have a my02 wrx with a power flow pannel filter new ngk 7s full decat system fitted and i was told by the old owner that it has been mapped as its running 1,1 bar of boost . just latley it has felt lumpy on tick over and a bit flat and not boosting as high around .8 to .9 bar ive cleaned the boost solenoid and no diffrence , checked all the pipes and they seem fine i i took the maf out and it was black and full of crap . is there any way to check it and clean it out any help would be great full as i am having to rev it quite hard to get any real pull .kev