when i fitted my miltek back in November i thought i would do a proper job and fit a new cat manifold gasket so i got one from NWP. I changed it and fitted the new exhaust and there was a hissing sort of zzzzz'ing noise under load above 3k, so did a bit of investigation and found this thread so i thought right i'll buy a genuine one. I fitted the renault one the other day and it was initially better but the noise soon came back. Does anyone know that when it is fitted right you shouldn't be able to see the gasket ring once all the bolts have been done up? Im thinking of putting the old gasket back in that must have done the best part of 70k and using that with the new bolts because the old gasket seems to fit better.
On a little side note, when i fitted my miltek i bought all new hangers as well from NWP and their shagged already, the rubber on the centre hanger has just about gone through, has anyone had experience of NWP of genuine ones, and is it another case of buy cheap buy twice?