Tinny Sound

[CB_Seattle]

Are those resonators welded or clamped to the exhaust.

They are clamped for now. If everything holds tight then I'll leave it that way. Else I'll be dropping some cash at the local exhaust shop to weld it up.

 

[PMR818]

I solved my sound issues with Ultimate Performance downpipes combined to a MBRP Pro catback. After some research, I took a chance and added a pair of Magnaflow resonators to the back of the MBRP x-pipe. Had to cut 18 inches off the connector pipe to the mufflers, but 99% of the tinny, buzzing, farting noises are gone. Only on a very cold start do I get a loud 1 second buzz. The roar is not as intense on WOT anymore and it will be missed, but I'm very satisfied that I can cruise in peace now. Here is a pic of the Magnaflows tucked in after the x-pipe.

Cheers

View attachment 71204

That’s really interesting! I’m going to have to figure out how to do something similar but keeping my Borla cat - or maybe the Magnaflows will work with my Borla like they did with your MBRP. Must eliminate cringe tinny noises ASAP! I’m in the process of buying my Stinger since the lease just expired so now maybe it’s time to just take it to some expensive car mod place here in LA to see what they think (some spots come highly recommended). My Stinger princess deserves the same treatment as Lambos…until I see the cost estimate!

 

[Boogetsbizzy]

I just ordered some resonators. I’ve actually grown a bit tired of the exhaust sound haha. I just want it now when I rip it.

 

[PMR818]

Hey I get it! Gotta love it. I'm on this journey too.

 

[CB_Seattle]

There is one important note from this...not many Stinger owners are upgrading primary downpipes. If it were the case then there would be packaged catback solutions that would be tunes for the higher CFM exhaust flow and still maintain a decent sound. The primary DP mod is overloading the standard catback systems and that is our problem. I can say that out of all my mods, the Ultimate Performance Downpipes have been the #2 mod after the JB4. If I had to make the hard decision then I would go back to stock catback. I'm pleased that the Magnaflow resonators solved the problem and I can have the end to end 2.5 inch exhaust system...even if it is a bit of a Frankenstein

 

[PMR818]

For sure. In the beginning I drove with just the JB4 and Borla and it was fun but the Ultimate Performance mid and down pipes have substantially made the acceleration better and smoother imo. So they’re keepers.

 

[919Stinger]

I think I'm having the same thing with Ultimate Performance HFC primary/mid and MBRP Pro exhaust. I upgraded the UP Pipes first due to a timing on installation help. The install went great with no CEL, and massive power gains. Big thumbs up there. I just took the next step with installing the MBRP yesterday. The install went great, but it was a shock how it sounds. Everything is clamped down tight, but it sounds like something is off. In the video, the loud rasp at startup is consistent between 2000 and 3000 RPM just going down the road. Low end on the road is a good rumble and high end has an amazing roar, but that middle note is not a good sound.
Let me know what you all think.

Sorry for the cut link below, I'm still too new to post full links. Just add the h at the beginning.

ttps://streamable.com/2fn5u3

PROBLEM:
DITTO!! I am disappointed with my same set up that you have. Cold start sounds the same too. But you cant really tell the issue from your vid, as it really is more irritating when driving around normally.

I installed the MBRP catback first, and it sounded great. Nice low end rumble, no raspy "tinny" tin can rattle sound at all. When researching the Ultimate Performance downpipes (primary and secondary) I opted to buy MBRP's resonators as well. When I pulled out of the shop with the UP primary + secondary DPs + MBRP (no resonators)..I said "Heccks naw" The resonators HAVE to help. BUT, after installing the MBRP resonators immediately afterwards, it really was NOT that much difference at all. You definitely get a raspy IRIITATING "rattle" type tin can exhaust note with this set up. Even my wife was like "uhmm. That sounds cheap" I went to a couple of custom exhaust shops, and they both were like they couldn't help - not without it becoming some involved expensive process. My personal opinion: It is not worth buying the MBRP resonators thinking it will solve the issue. It only slightly helped. I'd rather 1) get the U.P. downpipes 1&2, and keep the stock catback, or 2) get only the catback (and maybe secondary downpipe (or neither downpipe). But, you have to balance the performance you want performance vs sound...

SOLUTION?
When not driving hard, and just driving around normally, the sound *SUCKS* - OFTEN. But (for now) this is how I work around and resolve it
1) I found that driving in "SMART" mode really helps a LOT. If I'm not trying to drive peppy, Smart mode keeps the gears and RPMS low enough where I can drive normally with low to medium acceleration without getting that raspy irritating sound. then 2) MANUAL mode: If you shift manually, and focus on your pedal / rpms, you can find a sweet spot of acceleration where you can avoid the tin can rattle. Slight/easy acceleration at first, then push past the middle/low rpm where you have the issue. I swear, its like an art, but you can control it if you try. But, in fully automatic mode, driving normally, it IS a horrible experience with that tin can weed trimmer rattle sound with the full MBRP catcback + Ultimate Performance Primary Downpipe + Ultimate Performance secondary downpipe (+ MBRP resonators [minimal impact]).

Hope this info helps..as I decide whether to deliberately drive "around" the tin can rattle via my pedal input and drive mode, or change up the set up... :0/ Let me know what you all think

 

[SRV]

Nice write-up, but that's too bad for sure...

You can't be driving around in Eco mode, so go back to stock except for the MBRP muffler setup.

Once done, you can drive around in Sport with a big smile on your face, and most importantly, no more heckling from beautiful wifey!

You can sell the other unused parts to recoup some of your costs.

 

[919Stinger]

Nice write-up, but that's too bad for sure...

You can't be driving around in Eco mode, so go back to stock except for the MBRP muffler setup.

Once done, you can drive around in Sport with a big smile on your face, and most importantly, no more heckling from beautiful wifey!

You can sell the other unused parts to recoup some of your costs.

Yeah I only do that maybe in town or in traffic when I can't really punch it anyway to avoid that sound, but yep trust me sport mode gets put to plenty good use

 

[PMR818]

Are all of us with Ultimate Performance mid and down pipes in agreement that they increase performance significantly enough that they’re hard to give up despite sounds? Because I’m guessing that they’re still the only non-custom options out there that give the most boost for mid and down pipes. Just triple checking that the sound sacrifice is indeed worth the cost to some extent…in other words, help me with my cognitive dissonance.

 

[Hawk853]

Just an option…. Probably beyond what most are willing to spend for a solution, but a secondary cat could be added in place of resonator and would tame the rasp. I know lots of effort is being put into removing cats, but these are performing well and worth a Google.

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Obviously this isn’t the only option in cats, just the best. I’ve personally only used Magnaflow to date, but want to give these a try one day.

 

[Thomby]

Just an option…. Probably beyond what most are willing to spend for a solution, but a secondary cat could be added in place of resonator and would tame the rasp. I know lots of effort is being put into removing cats, but these are performing well and worth a Google.

If downpipes are the bigger restriction (1.25" on one side?), why not just replace those and leave the stock mids/cats? Or are the mids nearly as bad from a restriction/power standpoint?

 

[SRV]

Are all of us with Ultimate Performance mid and down pipes in agreement that they increase performance significantly enough that they’re hard to give up despite sounds?

Are there any before and after dyno charts showing the gains?

 

[Hawk853]

If downpipes are the bigger restriction (1.25" on one side?), why not just replace those and leave the stock mids/cats? Or are the mids nearly as bad from a restriction/power standpoint?

I think you and @SRV probably gave the best advice. I think this exhaust in general is great from the factory, I just want mine to sound good.
But if high flow is a must, those cats are an option.

I personally have no experience with pre cat deletes/hi flow cats with this car. I can only guess and offer expensive options. I mostly think those cats are really interesting to read about and wanted to share. With added benefit of cleaner exhaust if that’s important to anyone.

If you look at the top 20 1/4 mile record holders, many have stock intercoolers secondaries and down pipes, yet a lot of people go to great lengths and expense to install them. 1/4 mile performance doesn’t tell the whole story of course.

Helmholtz resonators can play a role, and are fairly simple, but a more robust silencer is going to do the most to help as someone above mentioned.

I have a growing pile of failed muffler experiments in my garage as I try to tame a different V6 beast.

 

[PMR818]

Are there any before and after dyno charts showing the gains?

Good question, don’t have unfortunately. Originally all I modded was the intake and then added JB4 and Borla cat. It felt rugged and fun, but still felt restricted somehow. Adding the UP pipes felt like the car got the breathing room it really needed to take full advantage of the other mods.

 

[PMR818]

If downpipes are the bigger restriction (1.25" on one side?), why not just replace those and leave the stock mids/cats? Or are the mids nearly as bad from a restriction/power standpoint?

Anyone try this iteration of only modding the down pipe but keeping the other pipes stock? In terms of getting rid of any rasp/tinny noises. I like my Stinger loud but at this point I’m def willing to cut the noise down to end the rasp saga. But still need some extra noise compared to stock!

 

[SRV]

Anyone try this iteration of only modding the down pipe but keeping the other pipes stock? In terms of getting rid of any rasp/tinny noises. I like my Stinger loud but at this point I’m def willing to cut the noise down to end the rasp saga. But still need some extra noise compared to stock!

The best sounding 3.3 Stinger exhaust I've heard was:

Stock up to including the cats, and then muffler-delete after the cats - super simple!

It had a very nice higher-pitched howl with no rasp at all - very racy without being obnoxious.

If I find it, I'll post a link.

 

[Thomby]

Anyone try this iteration of only modding the down pipe but keeping the other pipes stock? In terms of getting rid of any rasp/tinny noises. I like my Stinger loud but at this point I’m def willing to cut the noise down to end the rasp saga. But still need some extra noise compared to stock!

You have downpipes and catback, with stock mids? Or aftermarket everything?

If you still have your stock gear, maybe try swapping everything past the downpipes back to stock and doing a sound check?

 

[919Stinger]

Are all of us with Ultimate Performance mid and down pipes in agreement that they increase performance significantly enough that they’re hard to give up despite sounds? Because I’m guessing that they’re still the only non-custom options out there that give the most boost for mid and down pipes. Just triple checking that the sound sacrifice is indeed worth the cost to some extent…in other words, help me with my cognitive dissonance.

Yep, I feel you here. Honestly, I can (probably will) live with it, with my deliberate driving techniques to avoid the worst sounds at certain RPMs. But yes, there definitely is a noticeable improvement in performance. No dynos yet (due to not one being close that can do a variable (rear biased) AWD dyno like the GT2 is), but my RaceBox shows good improvement. I have:
JB4 tuner
FlexFuel Kit + Charge Pipe Injection (CPI)
EWG wire kit
BMS Intercooler
Oil Catch Can
E30 fuel (93 octane + E85 mix)
(considering TCU tune now as well...)

I failed to mention previously, YES, this set up sounds DOPE at full throttle/speed When driving hard, the full downpipe/mid-pipe/catback setup will either 1) make someone think twice about testing you, or 2) make some want to test you Lol. A few Teslas around here keep trying to battery-ize me LOL (No Plaids! heehee)

 

[PMR818]

Yep, I feel you here. Honestly, I can (probably will) live with it, with my deliberate driving techniques to avoid the worst sounds at certain RPMs. But yes, there definitely is a noticeable improvement in performance. No dynos yet (due to not one being close that can do a variable (rear biased) AWD dyno like the GT2 is), but my RaceBox shows good improvement. I have:
JB4 tuner
FlexFuel Kit + Charge Pipe Injection (CPI)
EWG wire kit
BMS Intercooler
Oil Catch Can
E30 fuel (93 octane + E85 mix)
(considering TCU tune now as well...)

I failed to mention previously, YES, this set up sounds DOPE at full throttle/speed When driving hard, the full downpipe/mid-pipe/catback setup will either 1) make someone think twice about testing you, or 2) make some want to test you Lol. A few Teslas around here keep trying to battery-ize me LOL (No Plaids! heehee)

I could not agree more on the above!!!