/\ but at the inlet, a t2 wouldn't be able to maintain 2bar of pressure though.
pressure is a measure of force over area and therefore it will require resistance to gain the pressure.
since then engine would be the same then the same volume of air would be required to maintain pressure per second from wherever it's from.
i understand what you mean about a t4 flowing more than a t2, of course you're right.
but with a given resistance, i.e. inlet ports/cylinders/throttle body all pipework you need a given flow of air to maintain this pressure.
if you have more flow and resistance is the same, then the pressure would be higher.
i dunno, i'm not an expert in physics, did a degree though, although more to do with astrophysics really.
p.s. the T2 thing, if it could handle the revs, then sure it could make 500bhp, but you'd need a big exhaust housing to get the gas out and that's usually where the t3 has a limit in housing sizes as standard.