hi unless your mot stations have rolling roads with dyno cant see how they test your horse power !! more likely its emissions and noise pollution as your mot is very much like ours !! down load decabel app for smartphone or tablet ( they usally free) find out what level @ what revs u need to pass then if u have to change your exhuast for test change it swap it back later ( over here kit cars cant be over 100db @ 3000 rpm as seen on wheeler dealers ac cobra episode) after whatching that episode took db meter app outside started up my s2 84db @ idle didnt bother finding out what it @ 3000rpm as for emissons stick super unleaded in and cross your fingers or get it tuned up!!