[PhoebusApollo]

IMO - I've done a lot of reading and the welded manifolds are NOT as good as the cast manifolds. Frequently the welded options look great but the metal is very VERY thin in places and people frequently complain of cracks in the welds. Also, if you read the specs on a lot of built KAT's the big boost setups include cast manifolds. That's not to say that ALL welded manifolds are bad, just that the cast manifolds will, in all likelyhood, last you a great deal longer and be less prone to commit suicide under the shittiest conditions in your car, the ass end of your 4 stroke cycle. :-P