Hello / Welcome

Carid looks like they carry a dual tip for your 2.4L. They have a single sided CAT back as well

They are both CAT backs so it wont be too loud

Just an idea
@carid

https://www.carid.com/2015-mitsubishi-lancer-exhaust-systems/borla-s-type-exhaust-systems-1002108559.html?parentsubmodel=SUBMODEL Sedan

 

I'm running a Greddy Supreme SP on my 2012. Looks and sounds great in my opinion. Not to loud, because of the new exhaust law in California.

 

I would make a custom exhaust, just buy your muffler.

 

I went custom 2 1/4 piping to the cat back and a Greddy SP exhaust canister and I always get compliments

 

2.25 inch is definitely the way to go however, catback system sadly does next to nothing performance wise.
By far the biggest restriction in your exhaust is the catalytic converter

http://imgur.com/a/EMOiL1d

You will need to drop in a mini-cat on the rear O2 Sensor or you will throw a CEL
http://imgur.com/a/l3sDM2f

I suggest dual resonator , make the front one bigger then the rear , put the front one as close to the sensor as possible but behind it if that makes sense

http://imgur.com/a/ZlVElKc

Hope this helps

 

Yeah I'm full pipe no cat and two resonators on my 2015 SE AWC and it has such a much better top end I definitely recommend if you can get away with smog laws and all that

 

Please don't run no cat
The planet is in bad enough shape as it is
100 cell cat will.do the trick nicely

 

Well I would love to run a cat but Mitsubishi quoted me almost 4000 for a replacement so until a aftermarket universal compatible one is manufactured I sadly will have to be running dirty

 

Feel free to read thru the links I posted earlier and check out the 200 cell cat made by "RAM"
Have a chat to your local exhaust shop, no doubt they will be on the shelf just like they were when I got mine

 

If you could provide the buying link for the ram cat I would greatly appreciate it

 

I walked into my local exhaust shop and had a chat to them
They have them behind the counter.
They are quite inexpensive

Fire up eBay or Amazon and search on
200 cell catalytic converter

And thank you for doing the right thing