I have had my new exhaust 2-3 months now and it has been adjusted once, but it still occasionally drags on speed bumps much to my irritation. I have 45mm long tube headers going into the 88mm pipe, but the problem seems to be the resonators as they protrude 10-15mm closer to the road than the pipe. I have kept my stock E55 mufflers on the back to keep the car a sleeper. Removing the resonators and replacing them with a straight piece of 88mm pipe is quick, cheap and easy, but will this make my car much louder around town as I use it as a daily driver? My exhaust shop say they will keep the resonators for me and can re-install them if the car is too loud, but they have never removed resonators from such a big exhaust and have no idea what will happen. Because the exhaust is so big there is zero space for anymore adjustment without vibration and rattle. I love a great V8 sound, but drone can drive me mental - good idea or am I just wasting my time? I am not considering removing the resonators for any added hp, just purely for the ground clearance as I am sick of forgetting to raise the car up and hearing the dreaded grinding sound.

It will make the car a tad bit louder that's all. I did not notice any significant drone without the resonators.

Would it be worth getting a tune since I have never done one with the new exhaust or is it a waste of time/money as my tuner has told me?

Your tuner doesn't know what he's talking about. I'll be he has never tuned one of these before. A tune does wonders for these cars, even more so with the headers you have installed.

I picked up ~40hp & ~30tq with just a tune on a stock motor.

Isn't 88mm like 3.5"?

Those are some big pipes.

Yup, 3.46 inches to be correct. They look like the down pipes coming from my gutters at home. The 4 X 45mm header pipes coming from each side fit very snugly into the 88mm pipe that runs from front to back and into the stock mufflers. The result is a deeper tone around town (not louder), but the whole world knows when you are giving it horns.