Looking for more information on your aluminium intake gasket for VT and do you get a warranty with it?

If the car is serviced regularly with good coolant and oil, then these gaskets could last as long as the inlet manifold or cylinder head normally would. Which is a very long time! 

Unlike the factory inlet manifold gaskets, the gaskets are far more resistant to thermal cycling, which normally leads to the gaskets cracking. 

These gaskets come with a 1-year, 20000km warranty if installed by a qualified mechanic. Though these gaskets will genuinely last much longer, it depends on the condition of your inlet manifold and cylinder heads, coupled with how the gaskets have been installed and how the car has been serviced.