I am trying to kill 2 birds with one stone, I need to replace my Y-Pipe due to the low RPM rattling upon accelerating. Dealer wants over a 1k to replace

I am now looking into an AM performance Y-pipe. any recommendations? I know the G35, 350Z, Megan all will fit. Looking for the best options with straight bolt on easy install.
looking to achieve HP gains and also increase the sound of the stock exhaust. Does anyone here run a simple set up like this? I am still debating on a cat back system but it will be tough since I do take clients to lunch and wouldn't want the car to loud while discussing business. Any input is appreciated.