Im looking to make a set of turbo manifolds after i lost by $2.50 whillst i was at taoday on ebay. Basically i know what im doing.. But i need to find steam pipe. Im not 100% sure what size i need. Im thinking atleast 3mm thick and prob 1 1/4 inch pipe???? Its for a vp buickengein. If anyone could help ide greatly appreciate it.

Michael