The 440 SIDEFEEDS are commonly swapped out. They're from 99/00 WRX/STi's.

If you want topfeeds, you'll need GD ones (01+) they commonly come as 380cc in WRX form (grey/blue color) or 550cc (pink). You can get the 380's for pretty cheap too.
All topfeeds, no matter what flow, can be chopped to flow 816cc.

__________________
Balls.