of the bonnet vents when I got distracted and found these:
They arrived in the post today so I spent sometime in the garage trying to work out how & where to fit them - ended up like this.
Next on to the popping and banging on overrun, I'd exchanged emails with Troy at Northampton Motorsports to ensure that I had the TB setup correctly before I go for a rolling road remapping session. He advised that if there was insufficient fuelling at low load below ~3,500 rpm there wouldn't be a stoichiometric mix, hence it wouldn't ignite in the cylinder and would be pushed into the exhaust where it would collect and ignite hence the popping & banging. The potential solutions were to either increase the MS/B setting or adjust the individual setting on the fuel map. The MS/B route was the most straight forward but it worked as a single scaling factor it would affect the whole map increasing the fuelling. The fuel map changes were possible without a RR as it was only the low load elements that were being changed. The screen print below shows the changes in the map in light blue, when the software is running you get a bulls eye graphic and indicators on the table that change colour with green indication that the map was in the right area.
Out on the road the changes were immediately obvious, once the car was warmed up there was almost no popping and only when decelerating from rpm than were greater than the changes that I'd made. I now think I'll leave it until I can get to NMS possible early next year before the late spring/early summer.