Hi all, 1st time Mustang owner here!

The seller replaced the entire exhaust...LTH, cat delete, resonator delete with H-pipe and MBRP cat back exhaust and swapped in Flowmaster Outlaws mufflers instead of the MBRP mufflers (he wanted a different sound after driving on the MBRP mufflers for a time). Car is on a 91 tune.

I'm debating if adding the stock resonator (which I have) back in would quiet the car down much and lessen the drone inside the cabin while cruising. The stock resonator will need fittings to neck down from 3" system on LTH to the stock 2.5" and then back to 3" for the exhaust.

Local muffler shop wants around $300-$400 to cut into H-pipe to swap it out and make the correct fittings. I worry that it won't do much and whether or not I'd have to get the car tuned again.