Hi all, I have spoken to a couple of people who have had the new free flow exhaust system fitted in the UK and have been told that the difference is very noticeable. I think Cat's were probably still in the early stages of refinement when the DeLorean was being produced and they have probably become less restrictive and so less detrimental to performance over the past 20 years. I am having a free flow exhaust fitted to my D hopefully in the next month or so it's about £800.00 including taxes & fitting. If it takes the bhp from 130 to 167 then that works out at an increase of 37bhp at £22 per 1 bhp. I will post my findings when I have had the new exhaust fitted and let you know what the difference is. James RG England