Pump should "plug and play".
The kit includes a new pigtail electrical connection for the pump.
you can choose to splice in the new pigtail or not, that is up to you.
"I" did replace my pigtail.
As for the "dropping the exhaust" argument.
If you get under the car, please tell me how you can drop the gas tank when the exhaust is there.
Believe me, I've done this job 3 times... the exhaust definatly had to be dropped.. otherwise you'll never get the tank low enough, or you will damage the exhaust trying to do so.
If you slide under the car, it should be blatantly obvious that the exhaust the goes directly UNDER the tank is going to be in the way.