Re: GTV6 Air Filter...
My 90 runs a K&N and has the same engine as the GTV6. Throttle response is improved by a very marginal extent but the car seems to breathe better at the top end of the rev range and is slightly faster although with cars of this age you would probably find the same level of variation between different standard cars.
My race GTV6 is more highly modified so the air filter is a small part of the whole. However both cars have had the air boxes removed so that has to be the way to go I think.