ph2 172
just come back from the nurburgring and was accompanied by one of my mates who just paid 600 notes for a s plate 306 gti now on paper my 172 standard should just pull on him but i was only just keeping up, it was quite annoying really mines on 60k with rs tuner map and itg panel filter did a full service with decent oil, gboxoil change etc only thing i didnt change was the spark plugs cause they were done not so long ago (according to previous owner) i think my exhaust was blowing ever ever so slightly, my question is where do i go from here to recoup my lost power?