i had a gander around my engine bay today since the engines out for modifying, and noticed my manifold (c20xe) has factory welds attaching it to the flange on the inside . these welds are on average about 4mm thick all the around. this must be up setting the flow/momentum of the exhaust gasses a lot
so im hacking it down with a hack sawblabe .
(i did do a search and nothing has been mentioned on the subject.)
what are your thoughts on this?