CAI's

what are the tubing in cai's made out of? ...generally

My AEM CAI is made out of aluminum...
Some people have made good homemade systems with PVC, or dryer hose and all kinds of stuff..

ya people have, but wouldn't use pvc, ect. Either buy and AEM or make one using mandrel bent piping. (aluminum or steel)

cool thanks guys...I found a great article on howto make one at jdmfan.com so thats what I shall do ;)