Hello. I plan on buying a Grand prix Gxp. And I also plan on only deleting the muffler just for the extra noise. I know there is a drone but from my understanding it's due to the afm at highway speeds. I'd like to know the best way to do this cheaply and keep the drone to a minimum.

Before you do that, check your local DVM laws. Some states or communities have a decibel law on the books. If it is too loud, you can be ticketed. It might be prudent to install a louder performance muffler like a Flowmeter or Borla and remain legal. Open exhaust on the streets are often a no-no by local law enforcement.