David, if you like to keep the noise down but have an effective enhancement of cold (and plenty) air stream, you could try this solution when using the standard air box (regardless of the brand or type of filter being used within the air box). It is a 2 GBP solution and it works very good and measurable, how fast the OBD2 readings of the inlet temperature comes down after restarting the hot car 15 minutes later as well as the throttle response is better when driving faster than ca. 50 mph.
http://www.talkmorgan.com/ubbthread...ment-sigma-4-4-oem-air-intake#Post673108
