I have a Magnaflow 2.25" oval muffler on an Apex'I Dunk Cat-back minus the Dunk muffler, 2.25" straight pipe, and DC headers on a H22. Currently, it has a buzzing annoying sound at around 2000-3000rpm and 4000rpm-up.
Now my questions are:

If I get a 2.5" Magnaflow oval muffler, would it be deeper? or buzzier? or louder?

If I get a resonator put on, Will that buzzing noise go away?

Any other advice? What's better? Magnaflow or ES oval? Whats quieter? whats the difference?

 

I have a magnaflow canister style muffler, "straight through design". It has a smooth deep tone to it, I wanted to replace my whole exhaust with 2.5" so I kept the cat, and had them put in a resonator. he said it would cause it to be more restrictive but it won't be nearly as loud. my bro and his roomate both have 2.5" all the way through, no-cat, no resonator, loud as hell, even when just cruising, it's a loud droning noise, and you can hear it far away when he gets on it.

 

the ones we sell and the piping we do all sound great.. not to loud and not buzzing at all

which muffler did you get ? how old? check your system for loose bolts/ heat sheild rattle or other things that might caseu it to make noise