I’ve got one of these in my 08 MCS. Easy install, assuming the old one hasn’t disintegrated and filled the turbo with plastic bits. Also, it loses less boost than the OEM one. But yes, details help, and welcome!
Are you talking about the turbocharger by-pass valve? Could you list the faults that you mentioned? To get the most accurate information, please include the year and model of your car in your signature.
Welcome to MA! @DneprDave is correct we do need more info to be helpful. But this is the best replacement for the stock BOV http://www.gfb.com.au/products/blow-off-and-diverter-valves/dv-plus/dv-t9352-suits-mini-citroen-and-peugeot-application-detail When the stock one fails some times it comes apart. Make sure you get all the pieces out before installing the new part.
