It’s been a while since I’ve posted here but there’s always good technical knowledge on this board. This is not Z related but a header question in general. I’ve got a set of BMW headers that doesn’t have consistent flange to primary pipe transitions. There are gaps between the primary pipes and the ID of the flange where ideally it should be flush (welded on the backside). Most of them are close to flush but the worst gap is about 1/8”.
My question is should I go ahead and use them as is or should I attempt to fix the gap? Can a high temp metal filler be used to fill the gap? I don’t really want to go that route but maybe someone has it before and has some feedback. If I have to weld to fill it I’d rather send the headers back. I’m sure the gap will have some effect on flow and performance but would it be enough to not use the headers? Keep in mind I’m not looking to extract maximum power out of the exhaust setup. I’m mainly wanting to get rid of the factory headers that have the cats built into them.