I doubt there is going to be much difference between those 2 models.
I did however find out that an exhaust change helps a lot. I thought the 4R was oddly loud inside when I first got it, but attributed it to the drive train. However, I put a Borla exhaust on my car and all of a sudden, it is significantly more quiet inside and you can hear the engine much more clearly out back.
I expect that the stock muffler drones like hell, and by swapping it, I got a better/louder V6 sound out back, and my interior is MUCH quieter.
