My Gen II has a couple of minor mods besides the exhaust - still nothing internal. Was running a PCV for fueling and had only used ECU Editor to shut off limiters, run the air shifter, raise the rev limit etc. Later I tuned IAP map and zeroed out the PCV under 10% throttle. Results were good and drivability was quite possibly improved (very subjective). I recently took the whole PCV out and went with the ECU Editor for tuning the Alpha-N operation of the map. Like everyone before me, I too am pleased to say it responds very well to changes.