well i dont know which sub frames you have. the ones i welded in mine were competition engineering and that was what they said to do and what some chassis shops said. and my car sits and launched straight. your frame might not be bent but if you have been to the track with slicks you might have a little tweaking of the torque boxes ,which while you are at it should be welded completely also, will make it hard to install.
but its all good
good luck,
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