Hi guys.... I know this Q has more than likely been answered time and again... but.... is there a more than likely reason my T has yet again dropped to NOT impressive stock performance?? I have got gradual but minimal boost.. (actuator has been replaced),, Exhaust bolts/studs are tight and all there.... vehicle has just had an 'everything done' service... And no, there has been no mod's done to the engine at all.. Latest upgrade was done in may. Do the T's suffer from blocked cat on a regular basis?... If so... is a high flow cat on a stocker my alternative option? Please help Adrian