Resonator Removal???
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Joined: Mar 2004
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From: Hooterville
Resonator Removal???
I'd like to give my 8 a little throatier exhaust tone so I am considering removing ONLY the standard resonator and replacing it with a piece of stainless straight pipe while leaving the factory cat and muffler in place. I've read that the factory exhaust system is already well designed for flow and since the catbacks I've seen wont produce a big power increase, I have a hard time paying the big $ they command for a slightly better exhaust note! I've searched for other threads to see if anyone else has tried this idea, but come up empty. Has anyone had success doing this, and if so, just how dramatic was the increase in tone? I also wonder if (because of the resonator's location below the cabin!) removal would create too much noise inside the car!?!
RainMan is Back
Joined: May 2003
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From: SF Bay Area
I haven't heard of anyone doing that, but I can imagine it would surely be louder...
Canzoomer sells a replacement mid-pipe (with both cat and resonator) and it is a bit louder than stock. So, I figure if you lop the resonator out of your oem mid-pipe your going to get an increase in decibals... :o
Canzoomer sells a replacement mid-pipe (with both cat and resonator) and it is a bit louder than stock. So, I figure if you lop the resonator out of your oem mid-pipe your going to get an increase in decibals... :o
Registered User
Joined: Aug 2003
Posts: 1,120
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From: Arizona
I agree, if you want a deeper, "throatier" sound then removing the resonator will not do this for you. Believe it or not a resonator is designed to do just that. Changing the muffler or catback exhaust will give you what your looking for. Just removing the stock resonator will only increase the volume of the exhuast note.
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See this link.. http://www.racingbeat.com/FRmazda4.htm
My experienced:
Removing the cat & resonator on the mid-pipe & change it with mandrel bent, its the cheapest way to get extra sound & little hp gain.
If the rear muffler also removed, then you'll get a freeflow exaust. Overall you get 5-8hp max gain on renesis engine, but the sound r so ****** loud!!
The results vary in every car. Different car, different character. Power gain can get easily on a car with bad-tuned engine/ecu. In a good-tuned car, usually only little or even no gain at all.
I think the things that matter if you do custom exaust is the replacement pipe size and the bending quality. Dont bend the pipe to much in every turn, so the flow can easy through.
For rx8, 2 or 2,5inch pipe is enough, dont use 3inch pipe except your car has 300hp /higher..
For pipe material choose that can long lasting/good durability with bad looking.. Is more cheaper..
Why spend more money to get more style for something you put under your car, nobody will see it thou'.. 
Btw, dont do this mod if your country has emission restriction..
## Bad english = so what :o
My experienced:
Removing the cat & resonator on the mid-pipe & change it with mandrel bent, its the cheapest way to get extra sound & little hp gain.
If the rear muffler also removed, then you'll get a freeflow exaust. Overall you get 5-8hp max gain on renesis engine, but the sound r so ****** loud!!
The results vary in every car. Different car, different character. Power gain can get easily on a car with bad-tuned engine/ecu. In a good-tuned car, usually only little or even no gain at all.
I think the things that matter if you do custom exaust is the replacement pipe size and the bending quality. Dont bend the pipe to much in every turn, so the flow can easy through.
For rx8, 2 or 2,5inch pipe is enough, dont use 3inch pipe except your car has 300hp /higher..
For pipe material choose that can long lasting/good durability with bad looking.. Is more cheaper..
Why spend more money to get more style for something you put under your car, nobody will see it thou'.. Btw, dont do this mod if your country has emission restriction..
## Bad english = so what :o
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