HI SIMON IF IT IS OVER FUELLING, BEFORE WORRYING ABOUT THE CAT LOOK AT THE LAMBDA SENSOR AND THE TEMPERATURE SENSOR THEY CAN FOOL THE ECU INTO ENRICHING THE MIXTURE. IF YOU ARE WORRIED ABOUT THE MAYONNAISE YOU COULD ADD SOME K SEAL (LIKE RAD WELD) TO THE COOLING SYSTEM THIS SEALS THE SYSTEM AND IS S...

Hi all, has anyone made any performance upgrades on their 40.l xjs and do they know any companys that can help (chip.induction,exhaust ?) any information would be great,thanks....

HI ALEX 18" SOUND GREAT TRY IMAGE WHEELS THEY MAY BE ABLE TO HELP, YOU SUPPLY THE MEASUREMENTS AND THEY DO THE REST THEY DO A EXCELLENT RANGE OF SPLIT RIMS,FORGED AND BILLET WHEELS. ALSO TRY WWW.SPLITRIMS.COM I HOPE THIS HELPS.....

HI JUST A THOUGHT BUT IS THE HEAD GASKET OK? MY FRIEND HAD A PROBLEM JUST LIKE YOURS IT SEEMS THAT WATER WAS SEEPING INTO THE BORES AND WHEN STARTING HE WOULD GET THE WHITE SMOKE,BUT WHEN THE CAR WAS WARM IT WAS FINE. TRY CHECKING OIL AND WATER TO SEE IF THERE IS ANY LOSS OR MIXING OF FLUIDS, THAT M...