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brontosaurus
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What sizes are the resonator, muffler, and what diameter is the pipe? Is your car naturally aspirated, supercharged, or turbo? Do you have a cat or header?

A full exhaust 2.5" or larger with a header on a naturally aspirated car will sound raspy. There's just not enough displacement to sound nice and deep. You will have to tune for sound using different mufflers, resonators, and glasspacks to get a good sound, or install a turbo. Turbos are great mufflers.

If you don't have a cat, or have a high flow, that will make the rasp 2x worse.

Glasspacks are good and cheap ways to deepen your exhaust greatly. Throw a 12"-18" one somewhere on the pipe, it'll really roughen up the sound.

Resonators can help, but they often leave a hollow sound. Large resonators can make the note deep, but it sounds like a deep monotone bellow. I personally think they sound shitty on small 4 cylinders.

The bigger the resonator, glasspack, muffler the better it will change the sound. On round body resonators, glasspacks, or mufflers the diameter is just as if not more than important than their length. A 7" diameter resonator will much more effective than a 4" diameter one.
 

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If u removed the cat thats ur problem
 

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Rehabilitation Officer
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Is it a buzzing noise like something rattling against the exhaust............like a heat shield perhaps? And the cat has to go before the o2 sensor. Resonator comes after it
 

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When you remove the cat it causes ricer rasp like civics at higher rpms. At least that's what happened when my cat got clogged and I had it removed
 

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Could be a loose piece of metal or welding in the muffler or resonator. The manifold all the way to the cat is littered with heat shields so start there. Sometimes the sounds are deceiving. It could be anything exhaust related.
 

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The piping diameter is part of it, but probably most of it is coming from the missing cat.
 

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Cat.
 

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brontosaurus
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A high flow cat wont do much for resonance.

large resonator, round body muffler, or glasspack.

Stick the longest one you can fit in your particular system. Even if you have to add two 12" pieces, the longer area the resonators can cover, the more resonance they can remove. The body's diameter will make a huge difference too. A 7' diameter body will help more than a 4".
 

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1,303 Posts
I don't have a cat and there is no buzz.

Riceland Header,RB resonated catless mid pipe Enthuza XR....2.375" pipe. NO buzz at all.
 
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