HAD MY COOPER S BACK AT AVA IN GLASGOW ON THE DYNO, AFTER LAST VISIT I HAVE BEEN RUNNING ON OPTIMAX NOW AND FITTED A CUSTOM STAINLESS STEEL EXHAUST SYSTEM FROM CAT BACK - LAST VISIT IT ONLY PRODUCED 126BHP AT THE WHEELS - THIS TIME IT PRODUCED 163.7 AT THE WHEELS WHICH IS ABOUT 183BHP AT THE FLYWHEEL - PLEASE TAKE A LOOK AT THE GRAPH. P.S. THE EXHAUST SYSTEM IS STILL FOR SALE (£320) THIS HAS ONLY BEEN ON MY CAR TWICE FOR SHOW DAYS - LUCKY IF IT'S DONE ABOUT 200 MILES!!!