The dealer is a tool! Anyone who tells you that it'll be too loud or sound like anything other than a well-built V8 are full of it!
My cars sounds smooth, low and mean. Its not too loud or obnoxious by any means. All the resonators are doing is restricting your airflow and muffling the sound so the older set that they were catering to generally wouldn't want to hear the exhaust....not to mention adding unnecessary weight. Delete the resonators, straighten the pipes, replace with 2.25", replace OEM mufflers with high flow Magnaflows, Megans, etc... and consider replacing the cats up front with hi-flowing ones. You'll notice a huge improvement in sound, a noticeable improvement in HP and better mpg just by replacing the mufflers/tips and removing the resonators alone.
I just bought my first Lexus a 1991 LS 400 with every option available at that time including ground effects... It sits right and looks mean but it sounds like a sewing machine instead of a V8...It seems to have a main muffler behing the cats and then two more out back at the bumper...are these back ones the resonators?? and are these the ones I should take off so it sounds right??? Thanks, Stroker