Hi guys, I'm after some info on Casting Magnesium vs Aluminium for wheels. If you have read my M20 build log you will see I'm making a lot of my own Die's for Uprights, bellhousings, Trans Cases, and Wheels. I have been told by the foundry I used for my Uprights that They can do Magnesium for my wheels after I expressed concern at the estimated weight of aluminium wheels They say its 2/3rds the weight but could cost as much as 5 times the price. Has anybody had experience with this and what were the draw backs?? is it really that much more expensive?? Does it need heat treating after?? and Is it stronger ??? any help would be apreciated. Cheers Leonmac.