Quietest setup with cat deletes?

[Need4SpeedMotors]

Thanks junior, what I haven’t been able to get a solid understanding of is if the Borla or Magnaflow resonators are quieter, louder or about the same as the oem resonator. I’ve read comments from people that vary wildly on that.

Ok I see, I have heard this resonator on my buddys car with headers and borla atak mufflers and it made a major difference in tone and volume. I wouldn't say the borla resonator it is as quiet as the factory resonator but it is pretty close. It is a straight through design so it is naturally going to have a little bit more volume. You won't be disappointed if you decide to go with it.

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[Andy13186]

I don’t beat on the car with them closed, it’s just to be quiet. I did have 18 active mufflers and I made a pass at the track with them closed, didn’t notice because the other car was so loud. Car lost almost 10mph. Never doing that again lol

Same with my Varex variable system, my 60-130 went from 5's to 8s lol. Not good to run with these variable systems closed at WOT while boosted. Just for cold starts or cruising.

 

[NGOT8R]

Same with my Varex variable system, my 60-130 went from 5's to 8s lol. Not good to run with these variable systems closed at WOT while boosted. Just for cold starts or cruising.

There’s a member on here (can’t remember which member though), who said his AE butterfly shafts bent on him. If my memory serves me correctly, it was caused by excessive pressure during No Lift Shifting via his WOT Box. I don’t know if boosted applications can generate similar or even more pressure than a WOT Box, but I thought I’d share that.

 

[junits15]

I would say more than likely. They were oem cats. I did find out after that happened that 18-early 19s had tsb for cat failure so they sound like they were a little weak to begin with.

I have a set off a 2020 now that I picked up used but am worried they will just get ruined again.

Mine failed, NA.....Put in headers when they failed. I wish I had looked into this before spending all that cash, do you know the TSB #?

 

[Wolfys11]

I have kooks catless headers, ess supercharger. I had armytrix catback but it was ear piercing loud. The quietest you can get is borla touring catback, it really gets quiet. I personally swapped the resonated h pipe for a x pipe as i wanted loud, just not you hear me 6 miles away loud lol

 

[pmor4243]

Mine failed, NA.....Put in headers when they failed. I wish I had looked into this before spending all that cash, do you know the TSB #?

Here is a link:
https://www.mustang6g.com/forums/attachments/tsb-19-2201-pdf.391583/

Good feedback so far. I ordered a set of vibrant ultra quiet resonators, they are a bitt different and quite a bit more substantial than the normal bullet style resonators- I had one of these on my truck after headers and the difference was pretty noticeable. Assuming I can find a place to fit them (I'm thinking I can get them to fit at the bend between the muffles and the resonators) I would imagine they would quite things down a good amount.

I have cats back on the car at the moment, as I would prefer to get things running correctly and not have to create additional steps for myself to pass emissions or worry about getting someone behind me with authority and knowledge that I don't have cats. Problem I am running into right now is that I cant seem to get the readiness monitors to all set. Never really paid attention to those in the past, but I did pass emissions last Feb and all monitors were set to ready. All things should be the same so I'm not sure how long those will take, but if they don't set in the next week or two, I will likely pull the cats for now and deal with this next year when I have emissions testing again.

I'm guessing I will be installing the vibrants here soon and will report back on the volume levels.

 

[NGOT8R]

Here is a link:
https://www.mustang6g.com/forums/attachments/tsb-19-2201-pdf.391583/

Good feedback so far. I ordered a set of vibrant ultra quiet resonators, they are a bitt different and quite a bit more substantial than the normal bullet style resonators- I had one of these on my truck after headers and the difference was pretty noticeable. Assuming I can find a place to fit them (I'm thinking I can get them to fit at the bend between the muffles and the resonators) I would imagine they would quite things down a good amount.

I have cats back on the car at the moment, as I would prefer to get things running correctly and not have to create additional steps for myself to pass emissions or worry about getting someone behind me with authority and knowledge that I don't have cats. Problem I am running into right now is that I cant seem to get the readiness monitors to all set. Never really paid attention to those in the past, but I did pass emissions last Feb and all monitors were set to ready. All things should be the same so I'm not sure how long those will take, but if they don't set in the next week or two, I will likely pull the cats for now and deal with this next year when I have emissions testing again.

I'm guessing I will be installing the vibrants here soon and will report back on the volume levels.

Here’s a video that I found of a 2018 GT with Vibrant resonators. They didn’t seem to quiet things down at all. If nothing else, it’ll give you an idea for placement.

 

[pmor4243]

Thanks. The ones I'm talking about are these:

They are essentially a mini muffler. I don’t think it will be night and day but realistically if I can cut about 20% of the volume and rasp down I think that would get me where I want.

 

[NGOT8R]

Thanks. The ones I'm talking about are these:

They are essentially a mini muffler. I don’t think it will be night and day but realistically if I can cut about 20% of the volume and rasp down I think that would get me where I want.

Oh yeah, I see. Those do look like they should quiet things down a little for you. Are they close in size to the factory cats?

 

[pmor4243]

Ya, they are definitely close. I think you may be able to get them mounted close to the stock cat position, but it could take some custom bending to make sure they clear everything.

 

[NGOT8R]

Ya, they are definitely close. I think you may be able to get them mounted close to the stock cat position, but it could take some custom bending to make sure they clear everything.

Please take some good pics for us and maybe a short video. I’d love to hear how they sound.

 

[Magnetic Stang]

Hoping to get some feedback from anyone that has had a similar goal.

I recently had my cats fail and put cat deletes on the car. I do have replacement cats to put back on but am on the fence on doing that right now.

I have the factory resonator in place with active mufflers.The mufflers are just wired to a switch in the car and are Really only ever open or closed. So track or quiet. With the factory cats, resonator, and mufflers open (in track mode) I loved the sound. Just the right volume in my opinion and a good refined sound.

With the cat deletes, things obviously got louder which I expected. I would like to try and get things close how they were. Is there a better option to quiet things down given that I already have an otherwise stock exhaust system?

I don’t know if adding a tru x resonator and some vibrant ultra quiets would do the job. Or maybeI would be better served with a different muffler. I would have to think there may be a slightly quieter straight through muffler design over the factory active but maybe not. I don’t want to create a bottleneck with the mufflers though, with my current set up, if I go WOT with the valves closed, the car will pull 2-3* of timing vs adding 3-4* with them open.

Any input on quieting this down would be great.

I did a cat delete while FP X pipe and Steeda axle backs. I'm n/a on E85. It sounded bad, really bad. Very loud and so raspy. I installed the Magnaflow resonated tru x and it made the car too quiet for me. Sounded quieter than stock. I removed it after 3 weeks. I ended up installing a stock GT350 x pipe with the resonators that I found on ebay for $120. It sounds good. Zero rasp but I would like a little rasp. lol

 

[pmor4243]

I did a cat delete while FP X pipe and Steeda axle backs. I'm n/a on E85. It sounded bad, really bad. Very loud and so raspy. I installed the Magnaflow resonated tru x and it made the car too quiet for me. Sounded quieter than stock. I removed it after 3 weeks. I ended up installing a stock GT350 x pipe with the resonators that I found on ebay for $120. It sounds good. Zero rasp but I would like a little rasp. lol

That's good to know. I have one of the magnaflow resonated x pipes on my bench as well. I keep going back and forth on which one to try first, but leaning towards the vibrants first.

 

[pmor4243]

Happy to report that the ultra quiet resonators did the trick. Since sound is subjective in terms what what people consider loud or sounds good, I would say the volume is very similar to the stock active exhaust. Due to the resonators and the tone, I would say in some place it may be a touch quieter due to a slightly different tone at WOT it may be just a hair louder, but overall, it is really close which is what I was going for.

So if anyone else is out there trying to do the same, this would be worth a shot. Here is where I put them:

Link to the resonators: https://www.amazon.com/dp/B000E3VHWI?psc=1&ref=ppx_yo2ov_dt_b_product_details

 

[NGOT8R]

Happy to report that the ultra quiet resonators did the trick. Since sound is subjective in terms what what people consider loud or sounds good, I would say the volume is very similar to the stock active exhaust. Due to the resonators and the tone, I would say in some place it may be a touch quieter due to a slightly different tone at WOT it may be just a hair louder, but overall, it is really close which is what I was going for.

So if anyone else is out there trying to do the same, this would be worth a shot. Here is where I put them:

Link to the resonators: https://www.amazon.com/dp/B000E3VHWI?psc=1&ref=ppx_yo2ov_dt_b_product_details

Looks like plenty of ground clearance. Could you have rotated them for even more clearance if desired, or would that have caused interference with the sway bar when jacked up? My right side axle back pipe kisses the sway bar when I have it in the air on my lift, but once it’s back on the ground I have about 3/8” of clearance.

Can you get us some sound clips of cold start, revving, cruising and WOT?

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