Ask any OEM if they would warranty any breakage on a modified product that is outside
of their published specifications...
In addition to federal laws governing this type of product...there are still some
states that have lesser exhaust rules. That is shrinking ever since that one
state other than Calif adopted stricter exhaust rules...
Part of today's torque control systems are not just to keep parts living past
their OEM warranty periods...but 'traction control', 'stability control', 'sway
control' and ETC...
Also, those are all tied (highly integrated) together with stuff like ABS...