My GTi is an 05 reg, have recently had a Twintake fitted, along with BCS Powervalve Exhaust, and a Stage 2 custom map! That said ive also had a new DV, PCV, and Cam Follower, they are needed essentially for modding! So yes, dont worry bout age too much! Like any older car, however, things do break, crack, etc, but not necessarily due to any mods!!