$85 hour is our labor rate..It takes 5 1/2 hours from start to finish on a GT..Cobra's are a freakin pain with the wide heads and front cross over (emmisions) tube the cobra's have..Hence the $150 more...
Higgins,MV ,No Limit,etc are around our price .Might try Mustang Service's or Dugans,they might be cheaper...There are a few other shops that might do it for less as well.
Call a few shops and tell them what we quoted..I promise atleast one of them will do it cheaper to get your business...Actually tell them we quoted you $450..You might really get a deal then.........
Tim