My 99 Camey(4cyl) was in for oil change at my Toyota dealer. Car has 69K miles, dealer tech told me car is perfect other than Flex Pipe has very slight leak. Said if replaced by dealer would be $1500 since they change the entire pipe assembly. Also said i could just as well have Midas shop replace just the Flex Section by cutting and welding new flex section. Cost about $200. Is this ok to do? They told me MANY camry's owners do this.