hi mate like you said its a provern product that works very , very well so why change it . its only picky people that say you might get better gas flow etc and yes iam one of those picky people but i only made this new one to try and up the torque but without puttin the engine on the dyno again who knows if it would make much of a difference? ians products are the best you can buy at reasonable prices for the zetec turbo and zvh , just look how much a primary design focus rs manifold is £995 WHAT THE FUCK . THATS NEARLY THE COST OF A EXHAUST AND A CUSTOM INLET FROM IAN AND SOME PEOPLE MOAN ABOUT HIS PRICES .UNBELIEVEABLE CHERRS MATE HOPE THIS HELPS