so i recently changed my exhaust to a 3 inch straight pipe with no resonators with a tanabe muffler. the car isnt too loud when driving on regular roads but the moment i jump on the highway and hold between 100-120 km/h it gets very loud continuously.

any of you have experience with a muffler or a way to quiet things down?

you can try a silencer

Put a kink in it! HA!
A decent muffler would do the trick, a resonator, or a silencer.

When you cars exhaust becomes too loud... then its easily fixed.. yoi just turn off your old man hearing aids!

Take a ride in any high end supecar.. I followed a diarglo on the 401 one day and I couldnr hear my own truck over it. Speed = loud.

Yeah your other option if you don't want to deal with changing the exhaust is you can add some sound deadening to the cabin.

I had nothing on my side exit, i added a resonator which removed some of the drone. but i will be adding a muffler at some point because it is still too loud.

Plumb a CAT or resonator..flange them so that you can remove or install it for track days and etests.

Exactly what I did, I found the Thermal R&D exhaust drone gave me a headache on long drives, I welded in a high flow cat and it was much more bearable.

Not just old people have hearing ads

A resonator or 2 will quiet things down. If you don't have a cat then install one as that will quiet things down a bit too.

^^

https://www.youtube.com/watch?v=C_8psojafbg

Well not quite what I meant.. But in a much faster scale.

Because an old POS DSM is definitely a high end super car

If your not running a cat, installing one will definitely help (high flow or metal core). Alot of the time the drone can be removed by using one or two resonators. IF thats still too loud for you, last option would be to get a quiter muffler. You typically don't want one with baffles on a turbo car, so with the straight through type, the larger the cannister, typically the quiter it will be as their able to fit more sound deadening material.

I run 3" DP back, metal core cat, 2 vibrant resonators & vibrant muffler. Under acceleration its abit louder (not as quiet as the family sedan but there are louder vehicles out there) but I don't have any problems with drone.

Its my super car! My budgetti Veyron!

I love coasting thru front street in belleville at 530am.. no traffic.. no people.. just me and my drooooooooooooooooooooooone. pshhhhh! echoing off the buildings! as the sun comes up! I dont even have a working stereo.

I can picture you singing to yourself...

"the wheels on the dsm go round and round...."

That's not straight pipe son!