^Good to know, I'm running a Milltek sports cat so should be OK as it just passed so I know the cat is capable come next MOT time now I've fully removed the SAI system.
Update on the CEL - came on after about 36miles and around 10 engine starts or thereabouts.
Also I have a question - been out this morning and removed the combo valve and all the hard pipes etc and I now have an unconnected vacuum line that runs from one of the solenoid valves under the inlet mani and used to connect to a tiny hardline that fed straight into the combo valve. What/where should I connect this to?
Also I have an open ended line that comes from the evap system and used to go straight to the TIP via another one of those hardlines, I've plugged the end that goes into the TIP but not sure what to do with this one as I've not removed (and unsure if I will) the evap system.
Any help appreciated!
***EDIT***
Edit to the above, after looking at the colour coded system diagram below (thanks to a google search, noting that this is the same diagram linked to on Vortex), my random vacuum line is actually for the N112 valve, which of course now serves no purpose. I understand my option here is to simply remove all vacuum hoses, cap off the inlet mani (as I've already bypassed the N249 so it doesn't get its vacuum feed from here), and leave the valve plugged in to prevent the ECU logging a code. I can remove the valve altogether but need to fit a 330ohm10W resistor?
That leaves me with one open ended vacuum hose, which is the one for the EVAP system that comes from the throttle body/charcoal canister into the hard pipe that runs along the fuel rail. It is at the end of this hard pipe I have removed the short section of hose that used to connect it into the hard lines that form part of the whole combi-valve assembly.
I note that this section of the EVAP system is past a one-way check valve, so it shouldn't cause any issues as it is, but I guess it's putting some fumes out so am I best dropping a length of vacuum down underneath car for the time being until I get around the deleting my EVAP system?