I have a twinair at home (which I still need to pay Brian for, shhh!) and they're supposed to be the dogs bollocks in combination with the snorkel mod.
I have used the K and N and it made a huge difference along with the snorkel mod mine is a 2004 see pics.I don't know about the twinflow i wouldn't think there would be much in it.
Just realised from your profile you are based in Morecambe, small world, I work at Heysham and travel through Morecambe most days from my home in Storth.
Hi there, regarding the TwinAir air filters, can you clean them and re-use them or once dirty/soiled do you need to replace them? Just looked at mine and it's a bit grubby to say the least! Cheers