I've got some OEM Corvette headers fitted on my 2002 F-body LS1, because the F-body ones wouldn't fit in my kit car chassis. I now find that the LS6 ones are slightly too bulky and are causing problems where they get near the engine mounts. Was thinking of buying some replacement headers made from tubular steel (as supposed to cast iron) which might give me that vital clearance - are there any I can buy which are a direct swap - i.e. the lower flange will line up with the rest of my exhaust system (which cost a bloody fortune and I don't want to scrap)?

Been offered some tight tuck headers from S&P but told they will require some welding - something I can't myself do (and would rather avoid if possible)