Hey, if you buy the TRD
axle-back exhaust, here is where you will have to disconnect the stock exhaust.
Kazuma exhaust (which is not street legal) is a cat back exhaust, meaning that it connects up much further towards the front of the car, and replaces the pipe that you were talking about in the PM you sent me under the car.
That exhaust needs to be welded onto the pipe.
axle-back exhaust just bolts on where the stock one comes off.