probably the cheapest way is to get the old manifold welded up, but it will break again. another option is a header, like borla, banks, etc. i just recently replaced my cracked manifold with an apn header, looked pretty stout and came out to like 160 shipped. it comes in raw steel, so i chose to paint it with some high temp paint i found at home depot. but, regardless of brand you get, put a section of flex pipe on your exhaust. that way it helps prevent future issues. i searched naxja for about a week to see what everyone else did, and more often than not it was the apn header.