Well with lt headers and full 3" with a 3 chamber magnaflow you could barely hear it at idle and it was not very loud at wot so might want something a little shorter then that. I just cut about 2.5" or 3" out of my muffler and it is about right for me. Not loud inside but you can hear it and a nice sound outside. But to each there own.

 

That's the 3 chamber, it's a ton quieter than what I have, which is the straight through....my big 24" Gibson is pretty loud dumped before the axle, and I think that it may be a chambered muffler (not sure). Plus, if I want loud, I just opend the cutout

 

I use to drive my Corsa without the duals behind, no freaking drone no matter what you do, Corsa works perfectly after RPM 2800 - 3000 , you will love that extra poping , your going cat-less ? Enjoy the fireworks under your truck then

I was going for a Magnaflow, at the last moment, I changed my mind and went Corsa. < Freakin' happy customer.

 

I like the Corsa systems, but that's all they offer now, complete systems...they discontinued the DB series mufflers