I emailed HTP about getting a 3" MAF housing to go with their 3" TIP and this was my reply.
"Next week, Jan. 3, we will be releasing our 3" MAF housing which includes the integrated honeycomb straightener. Price is $99.00.
However, at the same time we'll also be releasing our full 3" one-piece intake system with the integrated honeycomb and K&N filter. These will retail for $260.00 however we'll be running an introductory price of $240.00 (with free shipping) for the first month of their release. If you don't already have a 3" inlet, this route offers a pretty good savings over piecing together the inlet, MAF, filter, and 3" elbow"
So anybody looking at a larger intake the full 3" is plenty for the K04 and even still good for most BT builds. And im ordering one as soon as there released.
Info will be posted on Mazdaspeed Forums later this week.