Luke330i

Hi Greydog

The reason for not doing the bmw replacement is the 2k cost. They have agreed to the powerflow.

So they are installing a powerflow from the 2 precats on the manifold back...it had a powerflow box on it last year and that is still in good nick. From what I can work out the powerflow should do the trick but I dont want to have issues with the NOx after this is installed. I am guessing if the NOx is seeing a decent flow from the CAT it wont have any problems (current one is blocked apparently)

Hi all 

I'm having issues with my car giving catalyctic converter efficiency faults. The car has been into a BMW specialist and they have advised the Cat needs to be replaced (apparently they have used an endoscope to confirm the CAT is knackered). Luckily for me its under some form of warranty from the garage I got it from but they dont want to go with the stock replacement from BMW £1800 in the hole.

The solution they have offered is a custom fabricated powerflow exhaust from the pre cat to the back box.

From what I have been reading will this sort the issue? Does the NOx sensor need replacing as well? Is it worth taking out the underfloor cats and mapping the NOx out?

Any advice much appreciated

Luke 

Hi All

Went to a dealer last week with the intention of buying a Focus ST...

Ended up walking out with a 57 plate 330i SE with a genuine 45k on the clock...

Absolutely over the moon with it...

Any tips on keeping her fresh much appreciated 

Luke