Time has come for some tweeks and upgrades...Need more power I have a full Milltek system sitting in the grage waiting to be fitted. I have been told that once the Milltek (with 200 cell cat) is fitted without a remap I am likely to see an 'error' light on the dashboard. Is this true? Can I not have the exhaust fitted without a remap? I will get a remap done, but not now and want to feel the gains with the exhaust first...Then I will decide on the remap.