The BBK headers are a solid flange design. You shouldn't have any problem with heat warping. I know quite a few people with BBK headers and they haven't had any poblems with installing them or removing them. Check over the headers and h-pipe so you know EXACTLY what kind of shape they are in.
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~Dan
2001 SVT Lightning 
89' GT : Taking up garage space and waiting for a buyer...
Rice Hater's Club - Member #11
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