I have the BBK longtubes and they tuck up pretty tight underneath the car. I don't think you'll have a problem with them any more than the stock H-pipe.
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1985 Mustang GT
'85 GT "Red302" 12.96@107.1 N/A ... Sprayin' for the 11's
2003 Torch Red Mach1 
'68 Fastback ...331 Stroker "Restomod"
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