Ease of removing stock exhaust
 

It pulling the muffler easy? For autox, it is legal to pull the muffler for stock class. Less weight and more power is enticing.

not sure but maybe if you replace it with something to get it out the back, otherwise the exhaust fumes probably will go into the cabin stinking up your car + deadly carbon monoxide.

The flange is past the axle... fumes shouldn't be a problem

To the OP -- Looks easy, two bolts and some elbow grease. However you may need to secure the end of the mid-pipe somehow (not sure about the hangers).

It'd probably be best to get a turn-down fabbed up. Minimal weight, but at least some direction of exhaust heat away from the body of the car.