So I have a base 2008 TL AT and I recently did a mid and rear muffler delete. I was wanting to know what would happen if I change out the resonator as well to a magnaflow or Dynomax. And what also would be the difference compared to what I have right now the only other mod is a AEM CAI. Also I want to swap the stock tips for some different tips with a flush fit and I don’t want a quad set up

 

Honestly if you have removed all muffling and it's still not loud enough for your taste, your only choice is to fab two adapter plates to run PCDs upside down through holes cut in the hood like a demolition derby car.