stock exhaust with 2nd resonator removed

[dgraf]

Has anyone removed the 2nd resonator on their stock exhaust? If so, were you happy with your decision? How does it sound? Is it much louder? I might be removing it tomorrow. LET ME KNOW!

 

[240ka]

i removed both of the resonators before thr muffler and i couldnt be happier until i go turbo back exhaust. which wont be anytime soon.

Remove both resonators or youll just be back to remove the second one in no time.

mine were cut at the welds and replaced with str8 pipes so i can have them put back in when i want

sounds like i have exhaust. not over bearing. even when crusing. sounds like a STI mix with a Bit of EVO. cant wait to get my midpipe to add an even bolder sound

sounds like this http://jp.youtube.com/watch?v=i7MPJUpYsvI&feature=related. thats with both resonators removed

 

[dgraf]

I would remove both resonators but I have to drive into some quiet neighborhoods. I dont want to wake up everyone.

 

[240ka]

I would remove both resonators but I have to drive into some quiet neighborhoods. I dont want to wake up everyone.

i love it. its prefect and never over bearing or loud to where i would really disturb anyone(unless i get on it.)

but its is lloud when im backing to in my garage as well as at start up. good thing i have a company van i drive so i dont have to crank it up in the mornings during the weekdays

you will be fine in quiet places. just dont mash on it. these arent honda's. its a very tame

 

[240ka]

removing one wont increase the sound much at all. trust. remove both. wont be too loud

 

[LukeP]

I didn't even notice a difference from stock after removing one resonator. It wasn't until I started the car up again just after driving it, with the door open, and could feel the bassy tone coming up from the ground. Inside it mostly sounds the same.

It sounds more throaty for sure, and I'm told that when I'm on it (from outside the car), it sounds really good and growly.

Here's what it sounds like as best a recording can reproduce. I didn't tag it with resonator delete.

http://www.youtube.com/watch?v=LwCmM29Mjo8

 

[MSMS3]

So what exactly is the objective? Make more noise?

I'm not being critical, just trying to understand. I hope everyone understands that removing resos WILL NOT INCREASE POWER, but will increase boominess in the exhaust. The cat back part of our system is close to perfect from the factory and provides very little restriction. It's good for flow demands up to close to 350 rwhp. Each to his own, and if loud or boomy is what you want, go for it. The real purpose of those reso is to do what their name says: to remove resonations (specific frequency boominess) in the exhaust system occurring at certain engine rpms.

The problem is that the stock cat back system produces a very strong resonance and boominess at around 2500 rpm without the resos. The system is deliberately tuned to eliminate the boominess by using two tuned straight through resonators which tune out the boominess without decreasing power

I wanted more power, so I have deleted both the restrictive stock DP and highly restricive cats, replacing them with 3 inch DP and RP. Serious increase in power - dropped a whole second between 60-100 mph, but the stock resos would no longer handle the huge increase in resonation boominess at 2500 rpm, especially when decelerating. It seems the presence and effect of the cats was taken into account by Mazdaspeed engineers in selecting the frequencies those resos address.

This was amusing for a few days, but eventually was causing big headaches during my daily drive to and from work. So I actually ADDED A THIRD RESO where the second cat used to be and where the RP is now located. I had to cut the RP a couple inches inside each flange and weld the new Vibrant Ultraquiet reso inline between the two flanges. It's a 3 inch straight through design.

Presto: Power increase is unaffected and resonation cured. Exhaust is back to stock sound level, the booming and my headaches are now tamed, and I still have that big HP increase.

I've learned this from prior experience with turbo Saabs and turbo Volvos I have owned in the past when going for power gains with bigger and catless DP and RP combos. Of course, I'm in a state which does not have emission testing.

Sorry if I stepped on the intent of the thread. I'm just not sure what the objective of removing the resos would be. If it is to go for a certain sound you are looking for and like, I understand. If it is to try to gain horsepower, I respectfully say it ain't gonna happen by removing resos.

 

[240ka]

I didn't even notice a difference from stock after removing one resonator. It wasn't until I started the car up again just after driving it, with the door open, and could feel the bassy tone coming up from the ground. Inside it mostly sounds the same.

It sounds more throaty for sure, and I'm told that when I'm on it (from outside the car), it sounds really good and growly.

Here's what it sounds like as best a recording can reproduce. I didn't tag it with resonator delete.

http://www.youtube.com/watch?v=LwCmM29Mjo8

yep, thats why i removed both of mine. removing one wasnt much of a change from stock. its louder but not intrusive. sounds awesome

 

[240ka]

So what exactly is the objective? Make more noise?

I'm not being critical, just trying to understand. I hope everyone understands that removing resos WILL NOT INCREASE POWER, but will increase boominess in the exhaust. The cat back part of our system is close to perfect from the factory and provides very little restriction. It's good for flow demands up to close to 350 rwhp. Each to his own, and if loud or boomy is what you want, go for it. The real purpose of those reso is to do what their name says: to remove resonations (specific frequency boominess) in the exhaust system occurring at certain engine rpms.

The problem is that the stock cat back system produces a very strong resonance and boominess at around 2500 rpm without the resos. The system is deliberately tuned to eliminate the boominess by using two tuned straight through resonators which tune out the boominess without decreasing power

I wanted more power, so I have deleted both the restrictive stock DP and highly restricive cats, replacing them with 3 inch DP and RP. Serious increase in power - dropped a whole second between 60-100 mph, but the stock resos would no longer handle the huge increase in resonation boominess at 2500 rpm, especially when decelerating. It seems the presence and effect of the cats was taken into account by Mazdaspeed engineers in selecting the frequencies those resos address.

This was amusing for a few days, but eventually was causing big headaches during my daily drive to and from work. So I actually ADDED A THIRD RESO where the second cat used to be and where the RP is now located. I had to cut the RP a couple inches inside each slange and weld the new Vibrant Ultraquiet reso inline between the two flanges. It's a 3 inch straight through design.

Presto: Power increase is unaffected and resonation cured. Exhaust is back to stock sound level, the booming and my headaches are now tamed, and I still have that big HP increase.

I've learned this from prior experience with turbo Saabs and turbo Volvos I have owned in the past when going for power gains with bigger and catless DP and RP combos. Of course, I'm in a state which does not have emission testing.

Sorry if I stepped on the intent of the thread. I'm just not sure what the objective of removing the resos would be. If it is to go for a certain sound yu are looking for and like, I understand. If it is to try to gain horsepower, I respectfully say it ain't gonna happen by removing resos.

yep, all for sound. not performace. when i want performance is when ill go turboback. but since i have a warranty, im not going turbo back until my warranty is up.

my dealer is fine with the resonators gone. they like the sound.

these motors just doesnt produce a "LOUD" sounding exhaust. unless you do a straight pipe fromthe downpipe or open down pipe. which is why i didnt have the muffler cut out as well(sounds SRT4ish when you do to me anyways)

with both resonators gone the exhaust just has more of a voice but very clean and tame. you hear the grain of the exhaust note which i wanted. but the volume of the "bass or boom" from the exhaust the same which was the loudest sound coming from the exhaust-i think.

 

[MSMS3]

yep, all for sound. not performace. when i want performance is when ill go turboback. but since i have a warranty, im not going turbo back until my warranty is up.

my dealer is fine with the resonators gone. they like the sound.

these motors just doesnt produce a "LOUD" sounding exhaust. unless you do a straight pipe fromthe downpipe or open down pipe. which is why i didnt have the muffler cut out as well(sounds SRT4ish when you do to me anyways)

with both resonators gone the exhaust just has more of a voice but very clean and tame. you hear the grain of the exhaust note which i wanted. but the volume of the "bass or boom" from the exhaust the same which was the loudest sound coming from the exhaust-i think.

Does it boom at 2500 rpm? That's an engine speed that I use quite a bit in city driving. It was cool until the headaches started after a few days.

BTW: When your warranty runs and you go DP-RP, it wil get seriously loud if they are catless. I mean really loud. There are threads here on this. Unless you want to be a cop magnet, you will want to put those resos back on, so by all means, hang onto them. No need at all to do a complete turbo back unless you go to a bigger turbo. Just bolt the DP and RP to the stock exhaust. Flow is far better than the stock KO4 turbo can keep up with.

 

[240ka]

its no louder than stock. boom wise. no drone or anything. its very clean sounding

the volume of the car now is prefect. i dont want to sacrifce comfort. so when i go turbo back. i want to find a DP thats not going to drone like crazy

 

[LukeP]

its no louder than stock. boom wise. no drone or anything. its very clean sounding

Agreed.

The huge boomyness would come in if you removed the muffler (oval shaped one that people insist is just another resonator).

Check youtube vids on the muffler removed version, they are alllll bass and no increase in tone or voice.

My experience with previous cars is that muffler with no resonators produced more voice but less boom, however no muffler with resonators made car alarms go off just by driving by and it sounded megadeep and boomy.

 

[GoFast]

i took mine off and am quite happy with it. a little bassier and louder but not that much. to me it just added a little attitude to the sound that it lacked stock

 

[Boostfed_Mazda]

this probably sounds really stupid but were you guys speaking about removing both resonators and leaving the muffler?

 

[LReyes66]

Hey guys i plan on getting my resonators taken out and i have a few questions..


to make things straight there are 2 resonators u cant really see unless ur under your car and that mini muffler that u can kinda see next to to the exhaust right? And that mini muffler is what some ppl may call the "3rd" resonator right?

Ok well how does this resonator deletion process occur?
-DO we just take it to a muffler shop and tell them we want the resonators off and they just take it off and wield a pipe of their own to replace it or do we have to bring our own pipe for them?

And what should i do for the perfect sound? Take of that mini muffler and the resonator closest to it or take off the 2 resonators and leave the muffler or take both the resonator + the muffler?

Any quick input would help!

 

[skallen]

Both resonators, leave the muffler. A shop will provide the pipe. Should cost between $60-$80

 

[saxmanbrad]

i have a test pipe and the first reso cut...sounds really good, but the drone @ 2500 rpm is pretty serious. I don't mind it too much, but others have said it's pretty bad. I then tell them to shut up...but they can't hear what I'm saying b/c of the drone..I'm about to put a catted DP in, should be interesting how it changes the tone. That reso just might be comin back!

 

[ronin78225]

Does anyone know if removing the resonators will have the same effect on the speed6?