Re: Air filter PANIC attack
Sorry, for the slow response, i've been far too busy scratching my arse and generally drinking beer and watching telly...
Yes, the stub beneath the top of the filter housing is there to smooth the airflow into the MAF.
Yes this stub is restrictive.
To improve matters you'll want to chop the stub off (make sure the filter can still seat securely) and add a section of pipe between the filter housing and MAF. As a general rule of thumb you want to have the MAF at a distance away from the filter equal to 3 times the outlet pipe inner diameter. You can go down to 2 times, but you can pick up turbulence at higher flows.
When going for a revised inlet pipe, (from airbox to the air source at the front of the car) it's best to start from scratch and use a section of brand new pipe that feeds to a nice cool [stagnant] air supply. Bypasses the whole resenator & v6 intake mod issue, and eliminates any uncertainty.