Blitz make these too and are very popular with the Jap car tuners over here,Quikshift in the UK make them too,i had one and took it off for fear of what it doesn't filter!! Sounded good though

Mondeo V6 RS RS Bodykit RS Lowered SVT UIM SVT TB SVT LIM Philips 6000K HID ZENON Twin Stainless Exhaust