Tinny Sound

[MickeyDee]

Originally I was running the Ultimate Performance downpipe combo with the Australian My2021 bi-modal exhaust and it didn't sound too bad with the valves open. I then opted for the Kunstwerk HPX EVAC exhaust from the x-pipe back looking for better sound and performance.

I got the performance and a horrible tinny/farting sound when giving the car the go juice. At idle it is brilliant. When you back off it pops and gurgles and sounds pretty amazing.

Anyone had similar experiences? I don't want to remove the exhaust as it wasn't cheap and I wouldn't be able to sell it. I'm looking for a fix.

Reading these forums is it usually the aftermarket X-pipes that tend to give the tinny/farting sound?

Any feedback would be gratefully appreciated.

 

[PMR818]

Similar boat - Borla cat with Ultimate Performance HFC mid and down. Love the feel and performance - and I can kind of tolerate the rasp when shifting at high RPMs (would still be ideal not to have tho) but the rasps get terribly obnoxious at lower RPMs. Trying to find a solution that doesn’t involve buying different pipes. There’s gotta be way…!

 

[CB_Seattle]

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

 

[PMR818]

Just listened and that’s interesting how you get the sound on startup. Maybe someone else can relate and give solutions hopefully. Revs sounded great tho for real.

Anyways that raspy/tinny noise you got on startup def sounds similar to what I’ve been talking about when cruising in a high gear but at a low speed and then finally pressing the pedal hard to speed up causing me to instantly regret not manually downshifting a click or two as the car whines trying the push the rpm higher in the current non-ideal high gear. The whine persists a bit even with proper downshifting but it’s less crass. It’s a nitpick for sure but it’d be cool to mitigate at minimum.

 

[CB_Seattle]

The tinny/farting sound at startup is also the sound between 2000 and 3000 RPM when driving. I find myself slow rolling from a stop so that I keep the RPMs down. If I rev too much from a stop then it gets the bad sound again. As you said, it makes cruising very difficult. I'm going to reach out to Ultimate Performance and MBRP with the video to see if they have any ideas. If not, then I'm going back to the stock catback. The sound is just flat out embarrassing and doesn't make for a fun driving experience. Disappointing for sure because it has an awesome roar at 3000+ RPM when launching.

 

[PMR818]

I hear that. I’m gonna hold strong for now in hopes that a messiah arrives for us…

 

[CB_Seattle]

I called out to MBRP and Ultimate Performance for advice. It appears that aftermarket catback systems are designed for stock downpipes with stock cats. Changing the downpipes and cats are causing the tinny sounds on the aftermarket catback systems. Real bummer, as that means it can only be corrected with a custom exhaust system. That's going to be some $$$$. Super disappointing, so going back to stock catback for now.

 

[PMR818]

Thank you for the research and update! Soooo does anyone want to buy my Borla catback now? Lol

 

[SRV]

I hear that. I’m gonna hold strong for now in hopes that a messiah arrives for us…

I don't think one is coming for this because the root of the problem is the engine itself.

A 6-cylinder engine will never sound as good as a V8 due to the firing-cycle difference between the two and the resultant exhaust note.

Do a Google search on it for more details if interested.

 

[G70LEbyAdoom]

I called out to MBRP and Ultimate Performance for advice. It appears that aftermarket catback systems are designed for stock downpipes with stock cats. Changing the downpipes and cats are causing the tinny sounds on the aftermarket catback systems. Real bummer, as that means it can only be corrected with a custom exhaust system. That's going to be some $$$$. Super disappointing, so going back to stock catback for now.

Gonna need you to take a video of the sound you are talking about, for science reasons of course.

 

[PMR818]

I

I don't think one is coming for this because the root of the problem is the engine itself.

A 6-cylinder engine will never sound as good as a V8 due to the firing-cycle difference between the two and the resultant exhaust note.

Do a Google search on it for more details if interested.

I agree. I don’t mind the overall sound even when it makes the tinny whine as it accelerates bc the engine is what it is. There’s just this terrible version of the whine when cruising and then gunning it, as just one example, bc when cruising you’ll invariably go up a few gears more but then if you need to accelerate - even if you manually downshift - that whine becomes more crass and severe until the rpm rises to a level the car is okay with.

 

[CB_Seattle]

Gonna need you to take a video of the sound you are talking about, for science reasons of course.

Here is a video of startup and increasing throttle up to ~5000 RPM. The first few seconds of the video is the noise at startup as well as when cruising between 2000 and 3000 RPM.

I'm too new to this site to be allowed to publish full links so you'll need to add an H to the beginning of the link below to see the video.

ttps://streamable.com/2fn5u3

 

[PMR818]

After messing around here and there with the FF in user adjustments in the JB4 app by increments of 5 down and up, I finally found the real sweet spot number which helps with the whine. But keep in mind I have the EWG add on connectors which is the real reason I think why messing with the FF has helped a little. Also, if you have those add on connectors and adjust the FF, the best advice I have is to change it and then drive for a while before trying another number.

 

[CB_Seattle]

After messing around here and there with the FF in user adjustments in the JB4 app by increments of 5 down and up, I finally found the real sweet spot number which helps with the whine. But keep in mind I have the EWG add on connectors which is the real reason I think why messing with the FF has helped a little. Also, if you have those add on connectors and adjust the FF, the best advice I have is to change it and then drive for a while before trying another number.

Do you have video of before and after?

It would be good to hear the difference as I haven't sold off the MBRP yet and would prefer a solution before I head in for custom catback.

 

[PMR818]

Do you have video of before and after?

It would be good to hear the difference as I haven't sold off the MBRP yet and would prefer a solution before I head in for custom catback.

Dash cam sound quality prob not good enough. General side note for all: my experimenting with FF number on JB4 still continues... Was still getting some overboost lately again even with EWG add ons. I attribute it to my continued guess and check method with ethanol aiming for the illustrious E30 mix whilst using maps 3 and 4. Right now I've rid my tank of ethanol and I'm just running 91 on map 1 and this has felt the most reliable in terms of performance and exhaust sound. I'm coming to accept more and more that yes there's going to be a tinny/rasp exhaust noise to some degree, especially when not driving fast (ie shifting at high rpms) bc tis v6. It's all good.

 

[General_Vodka]

I have a Borla with QS resonated catless mids and I don't really have much rasp complaints. On cold startup there is a small tinny or irrr sound but it goes away and the rest of the drive is solid. There is a bit of drone at highway cruising but I can live with it. Maybe the big factor in your issues is the catless down pipes since I am still on stock ones.

 

[PMR818]

Interesting, wonder if there’s a pattern to be seen of others with a similar setup as you yielding the same/similar results.

 

[General_Vodka]

Interesting, wonder if there’s a pattern to be seen of others with a similar setup as you yielding the same/similar results.

From what I heard a lot of exhaust sound issues start when people go fully catless and non resonated. Those with high flow cats or resonators see less issues. That's why I went with the QS mids. That and they were on a massive discount lol. I do think that if I do catless mids then I will bring out some unwanted noise. However that's not on my list since those are a massive pain to install.

 

[CB_Seattle]

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

 

[Boogetsbizzy]

Are those resonators welded or clamped to the exhaust.

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

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