Just browsing ebay for magna parts...... as you do!!!
Came across these. Brand spankers and only $80
Very very cheap and Genie as well!!! Vee

http://www.ebay.com.au/itm/MITSUBISHI-MAGNA-EXTRACTORSMITSUBISHI-MAGNA-TM-TN-TP-TR-GENIE-EXTRACTORS-/110873940598?pt=AU_Car_Parts_Accessories&hash=item19d09a1276

they look like carby only that's why there cheap

Just a matter of cutting and welding up the pipe for emission control and adding a connection for the oxygen sensor. easy to do and save a bundle on extractors. Vee

We have the eBay thread (http://www.aussiemagna.com/forums/showthread.php?t=81749) for this exact purpose.