i have read up on a few like the fast car write up, also the JMS thread. Its seems as though most induction kits offer an inbalance of power and thorque, therefore only really good for noise. Also the acoustic vavle seems to be a favourite to remove but i personally dont see the point.
I am currently rocking the standard set up as it simply seems the best. Maybe apart from the JMS induction kit but am waiting for more feedback on the results.