Cheers kk i am definitely going for the cat-back Peco and eventually a 4-2-1 and a sports cat as i cannot be arsed changing it over at MOT time, mind you i have heard that some people who have a similar system to yours and have an Ecotek fitted have actually reduced their emissions, my only dilemma now is what air filter to fit with a complete ST170 induction system...

Cheers Daz