I understand the various parts that make up the kit are known brands presumably sourced/supplied to Mountune to make up the kits. I have heard the air filter is K&N, exhaust is Magnex, don't know about manifold, obviously the ECU receives an update and maybe Mountune have worked their wizardry with Ford on that, not sure. So that answers both your questions, try Emailing mountune or ask an approved dealer if sold seperately but you wouldn't get the update for the ECU, the update is recognised by Ford diagnostics so should never be accidently deleted.
Wish they would hurry up, I have also Emailed Adrian Flux for a quote and at same time sent them the details of the kits so that they can prepare for customer enquiries on this - not heard back yet.
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MR200 Stage 3 200PS
Evans Halshaw
Mountune Pro