how to quiet down 3 inch exhaust

ive got a full TTI 3inch x pipe exhaust on my duster. headers back to rear bumper. im running the kit just the way ot was delivered, with dynomax super turbo mufflers, clamps, their hangars, everything.

im only putting 425 at the wheeels off the bottle, so i know its overkill. but its paid for.

what im trying to do is quiet it down some. its really freaking loud, both inside the car and outside. really takes away some of the driving enjoyment when you have to almost shout at your passenger.

i know the best thing to do would be to sell it and get a 2.5 inch exhaust, but i wont get hardly any of the 600 bucks i spent on it back, and really dont have the 500 to spend on their 2.5.

any ideas of what i can do to get the note down some more? im looking for lower budget solutions here. i was thinking of a pair of canister style cats, resonators, something along those lines.

this is on a 70 duster, and real estate under there is pretty tight, so another pair of fullsize mufflers is not an option. a pair pf more quiet mufflers may be, though.

thanks for any help you can give me.

Michael​