Do all catless header sound like complete garbage?

[Irace86.2.0]

I have a supercharger, which probably makes a difference, but I've always like my Greddy Supreme SP exhaust. No drone. Pretty tame sounding, but sounds aggressive when I open the throttle. Now I have the Ace150. I wrapped the header in DEI Titanium exhaust wrap, so I don't know if that matters in muffling any raspiness of the header, but the sound is very nice. It seemed to just take the volume and throatiness of the exhaust note up a notch.

I still have the stock front pipe. I have no plans to alter that.

[solidONE]

Originally Posted by Irace86.2.0

I have a supercharger, which probably makes a difference, but I've always like my Greddy Supreme SP exhaust. No drone. Pretty tame sounding, but sounds aggressive when I open the throttle. Now I have the Ace150. I wrapped the header in DEI Titanium exhaust wrap, so I don't know if that matters in muffling any raspiness of the header, but the sound is very nice. It seemed to just take the volume and throatiness of the exhaust note up a notch.

I still have the stock front pipe. I have no plans to alter that.

From testing various mid pipe and even making a dual resonated one myself to test, I've also settled on the stock front pipe.

There are several advantages with the trade off being mainly top end flow ( and power). Droneless, scentless, and as far as I can tell the least likely to produce false knock readings ensuring consistent performance. Also... it fits perfect.. it s OEM.

[86TOYO2k17]

Originally Posted by solidONE

and as far as I can tell the least likely to produce false knock readings ensuring consistent performance. .

This is interesting,
What makes you claim this?

Also are you still using the cat in the oem FP or did you knock it out?

I had hks dual res FP but it ended up cracking so i went back to OEM but knocked out the cat. definitely a different sound, not necessarily better or worse just different.

[Purist]

Can't say if they all do but my PSR UELs definitely have a 'pulsing gas flow' sound. I got used to it.

Sent from my SM-G973F using Tapatalk

[solidONE]

Originally Posted by 86TOYO2k17

This is interesting,
What makes you claim this?

Also are you still using the cat in the oem FP or did you knock it out?

I had hks dual res FP but it ended up cracking so i went back to OEM but knocked out the cat. definitely a different sound, not necessarily better or worse just different.

It may have something to do with the long tube headers as well along with the cam timing. At about 0.6 loads and low rpms up to 3500 rpms there would be KC and flkc activity half the time. Exact same condition seconds apart. It would register knock on the first "pull" but not the second time in the same conditions. Reducing timing in the tables does not effect it.

Although using the same front pipes that were registering knock on the long tube with either OEM or the Tomei EL I had, there was no "phantom knock".

[mrg666]

I have the stock header with HKS front pipe and HKS HiPower SpecL exhaust. This combination sounds pretty tame when the engine is healthy. But I noticed that when my engine was running rich because of a faulty MAF sensor, exhaust sound was terrible. An unhealthy engine or bad tune can also cause bad exhaust sound especially with aftermarket setups that are barely muffled. I like it this way, it is an alarm sound for my engine to tell me that it needs maintenance.

[Jo0]

Shitty video of my ACE350 with stock everything else. I have no desire to do get a catback yet as I'm still happy with how it sounds. If I do get a catback it'll either be the CSG 86 touring or the new Tomei Titianium Dual Exit.

[Wil]

Originally Posted by Jo0

Shitty video of my ACE350 with stock everything else. I have no desire to do get a catback yet as I'm still happy with how it sounds. If I do get a catback it'll either be the CSG 86 touring or the new Tomei Titianium Dual Exit.

Back to this thread (as the OP) after I tried reinstalling my Openflash header. i kind of like the sound when cruising, but I can't bear the tiny resonance under load. We can hear it in the video above on decel, it sounds like a rattlesnake.

I have an active exhaust muffler which allow me to open, close or let open the valve under acceleration. With the stock muffler, it sounds very very cool.

With the OFH, I close the valve and I can hear this tiny sounding resonance up front...
I'm into buying a Rogue Motorsport manifold because I love the catless manifolds gains. But I really can't bear the sound.
I guess that's one of the throwback of going catless with a four-cylinder...
While standing still, it's almost unnoticeable. But on load at lower speed it's driving me nuts. I don't understand how no one else seem to complain about that.

So I'm still trying to see if there's a cure to this.
I don't want to go supercharged as I love to be able to exploit the full potential of this car at all time.

[Jo0]

Originally Posted by Wil

Back to this thread (as the OP) after I tried reinstalling my Openflash header. i kind of like the sound when cruising, but I can't bear the tiny resonance under load. We can hear it in the video above on decel, it sounds like a rattlesnake.

I have an active exhaust muffler which allow me to open, close or let open the valve under acceleration. With the stock muffler, it sounds very very cool.

With the OFH, I close the valve and I can hear this tiny sounding resonance up front...
I'm into buying a Rogue Motorsport manifold because I love the catless manifolds gains. But I really can't bear the sound.
I guess that's one of the throwback of going catless with a four-cylinder...
While standing still, it's almost unnoticeable. But on load at lower speed it's driving me nuts. I don't understand how no one else seem to complain about that.

So I'm still trying to see if there's a cure to this.
I don't want to go supercharged as I love to be able to exploit the full potential of this car at all time.

resonance in your cabin or from your headers?


I actually got the CSG Touring86 catback a few months ago. Love it in combination with the ACE350. (still have stock FP)


I don't get resonance/drone in my cabin at all. I still hear slight resonance/turbulence in my headers, and I actually kind of like it.

[NoHaveMSG]

Originally Posted by Wil

So I'm still trying to see if there's a cure to this.
I don't want to go supercharged as I love to be able to exploit the full potential of this car at all time.

Think about the effect of tapping against a thin piece of sheet metal with a wrench, and a thicker piece that is say 4mm thick.

After market headers are usually thinner than OEM, don't have heat shielding, and no cat. So there is a lot less to dampen the sound. You could try heat wrapping it to help mitigate it some, but you won't be able to eliminate it completely.

[Thefalls]

Originally Posted by Wil

Back to this thread (as the OP) after I tried reinstalling my Openflash header. i kind of like the sound when cruising, but I can't bear the tiny resonance under load. We can hear it in the video above on decel, it sounds like a rattlesnake.

I have an active exhaust muffler which allow me to open, close or let open the valve under acceleration. With the stock muffler, it sounds very very cool.

With the OFH, I close the valve and I can hear this tiny sounding resonance up front...
I'm into buying a Rogue Motorsport manifold because I love the catless manifolds gains. But I really can't bear the sound.
I guess that's one of the throwback of going catless with a four-cylinder...
While standing still, it's almost unnoticeable. But on load at lower speed it's driving me nuts. I don't understand how no one else seem to complain about that.

So I'm still trying to see if there's a cure to this.
I don't want to go supercharged as I love to be able to exploit the full potential of this car at all time.

The Rogue is a beautiful piece of art.

[e_lunatic]

I have a gruppe-s UEL with no cat. the rest of the exhaust is stock. sounds great and has zero leaks or rasp.

[SumDizzy]

I have a catless el header (JDL 4-2-1), stock front pipe, and the Perrin 3" Resonated catback. It had an obnoxious tinny raspy noise coming from the back of the car; sounded like two thin sheets of metal vibrating on each other. I wouldn't really hear it while revving in neutral, but it always came up when under load especially at lower rpms. Also had some in-cabin vibration with it.

I just assumed it was the expected raspiness that comes with aftermarket catless headers and a 3" exhaust. More research showed me; however, that the tinny noise I was hearing probably wasn't the same thing as what a lot of people refer to as "rasp".

Finally had a chance to jack it up today and inspect everything and ultimately discovered that the rear hangers had settled in a way that allowed one of the exhaust tips to just barely vibrate against the rear diffuser in certain conditions. The Perrin catback comes with shaft collars so I used them to lock the bottom part of the hangers against the 90 degree bend in the shaft. This was to prevent some side-to-side vibration and to keep them from settling weird again. That seems to have more or less fixed the issue for me. I also ordered an extra set of 1/2" shaft collars to keep the top part of the hangers from moving around.

I still hear a somewhat raspy noise, but it does not sound tinny any more and instead sounds more like it comes from moving air if that makes sense. Sounds much better to me. It also mostly fixed the in-cabin vibration.

Oh and I also have the softer STI hangers to help with drone so they might have had a role to play in this.

[sygfrid]

Here's catless Gruppe-S UEL, HKS dual reso front pipe, & stock cat back: