My car is 450bhp+ and has got a fairly small air filter compared to most cossies. Apparently it is a high flow one, was set up using it, and cost a fortune etc etc

Under hard boost it chatters / flutters really bad - i cleaned it to see if it made it better but it didn't...is it struggling to breathe when it chatters? am i best replacing it for a larger one or would it make no difference? - i.e. is it meant to do it