again yes thats true that you can mig weld aluminum, but making it pretty is really tough and takes alot of practice, i spent a bunch of money on my spool gun and argon tank and teflon liner only to make a birdsnest everytime. again not that its not doable, but the home guy probably won't. not to mention you cant do aluminum with a 110V mig. you need at least a 220 v mig so you can get enough heat into the aluminum being welded.

I found that picture of Hoover's intake on his Plymouth. This was his street car but still set a record on the strip.