Obvious answer to that would be a bad MAF. They'll hit your MPG if they go on the wonk and if they're properly shot the TCS light comes on - MAF readings are required for the TCS/ESP to work properly. Have you any way of checking it, i.e. VAGCOM/VCDS or a liquid gauge, for example?
Maybe a bit late now but you can also try disconnecting it and drive about, if the car feels any better then you know it's shagged. The TCS light will come on and stay on if it's disconnected, eventually the car will go into limp mode until you connect it again.
Front ARB is a nice mod, it's more subtle than I was led to believe. I only really notice it if I'm pushing on quite hard, but then I got the Golf R32 23mm one, the Neuspeed is likely stiffer so you may feel it more obviously. Have you done the rear one yet?
Thanks someone else motioned that it may be the MAF. I was planning on buying a new MAF and N75 valve before mapping anyway. My cars driving really well at the moment so I guess it's time that something else went wrong lol.
I've got a 28mm Nuespeed rear ARB fitted to the medium setting and the front is 25mm. I'm really happy with the way the cars coming on. I just need to have a think how far I'm going to go with it before I start saving for my weekend car.
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