Flowmaster AT catback drone HELP - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

wfydaniel1990 · 02-19-2017, 10:12 PM

dear everyone,
it's my first post on this forum , I'm a super fan of american muscle car(camaro to be exact) from Beijing. I have 1 set of flowmaster american thunder catback system (with outlaw mufflers) . after 2 months' travelling them finally arrived, after i put them on my car, the sound is marvellous and aggressive, but···· the resonance around 2k rpm is so obnoxious, it really drones a lot, i wonder if the flowmaster resonator can work with my exhaust system to kill the drone, even if i'll have to sacrifice 1/3 sound to get rid of the drone, i'll do it .

BTW, my car is a 15 RS 3.6L with D/M mode V6. (the only version GM sells in China) . i'm kinda desperate now, it;s my daily driver, i drive 40km to my workplace on high way everyday... i really love the sound, hate the thought of giving it up...

I wish everyone a happy chinese new year ~

wfydaniel1990 · 02-19-2017, 10:15 PM

HELP please

608RS · 02-19-2017, 10:39 PM

happy chinese new year! since parts may be difficult to get since you're in China, why not head to a local exhaust shop? Maybe you can pickup a resonator and have them weld it on?

wfydaniel1990 · 02-19-2017, 10:53 PM

Quote:

Originally Posted by 608RS

happy chinese new year! since parts may be difficult to get since you're in China, why not head to a local exhaust shop? Maybe you can pickup a resonator and have them weld it on?

Thanks man ~ i thought of that too,but it‘s kinda embarrassing for me to say that i dont really trust the cheap resonators here in China, i wonder whether the x-pipe helps or not , maybe should I weld 2 j-pipes around the mufflers ?
I know I may sound like an idiot,but i dont know where should i weld the resonators in

```

Linker239 · 02-20-2017, 05:50 AM

Magnaflow Resonated X pipe will solve most sound problems, however your going to loose a lot of volume.

wfydaniel1990 · 02-20-2017, 07:27 AM

Quote:

Originally Posted by Linker239

Magnaflow Resonated X pipe will solve most sound problems, however your going to loose a lot of volume.

i've been browsing amazon for the whole afternoon, there is only one version magnaflow 12599 tru-x pipe that has 3'' in/outlet, but i believe it's to long (28'' overall)

i can settle with 12469 (24'' overall), it's shorter,however it has center y-pipe cutaway.. i wonder if the y-pipe works the same as the tru-x pipe. if they are more or less the same i'm gonna place an order and wait for another months maybe.

Hulk · 02-20-2017, 07:39 AM

Generally on a V8 the x pipe will cackle a bit and a h pipe will be deeper sounding. I have the solo j pipe system on my V8 and it eliminates my drone but I am far form stock and I do not know if it will work with your system. The V6 guys will chime in and give you some guidance soon.

Maybe drop the trans down a gear for now and increase the rpm at cruise to get you out of the 2000 rpm drone zone.

wfydaniel1990 · 02-20-2017, 07:46 AM

Quote:

Originally Posted by Hulk

Generally on a V8 the x pipe will cackle a bit and a h pipe will be deeper sounding. I have the solo j pipe system on my V8 and it eliminates my drone but I am far form stock and I do not know if it will work with your system. The V6 guys will chime in and give you some guidance soon.

Maybe drop the trans down a gear for now and increase the rpm at cruise to get you out of the 2000 rpm drone zone.

thank you, you're right, i'm currently driving with M mode, it helps the droning situation, but you know the fact that drone is still there gets on my nerve all the time.

KillboyPowerhead · 02-20-2017, 08:52 AM

J-pipes do a great job of eliminating drone. I had a custom cat-back installed consisting of a "resonated x-pipe" by Magnaflow (part 11386) and then 2.5" pipe back (removed factory resonators and mufflers) and it droned a fair bit around 1700 - 2200 RPM or so, so I had j-pipes from Solo Performance added and the drone is almost gone, just a little bit around 1700 RPM, and even then it's much quieter. Solo Performance j-pipes are adjustable in length so you can "tune" them to find the right length to remove drone.

Linker239 · 02-20-2017, 09:53 AM

I'd try the res x-pipe first, I think that will solve it, J-Pipes would take out the drone for sure, but they may not fit as those mufflers take up quite a bit of space. They might fit, but it would take a lot of fab work, and I'd want them welded.

Juiced1 · 02-20-2017, 10:05 AM

Quote:

Originally Posted by wfydaniel1990

Thanks man ~ i thought of that too,but it‘s kinda embarrassing for me to say that i dont really trust the cheap resonators here in China, i wonder whether the x-pipe helps or not , maybe should I weld 2 j-pipes around the mufflers ?
I know I may sound like an idiot,but i dont know where should i weld the resonators in

```

If you can have them weld in some J-Pipes that would be your best bet. These always work to eliminate drone. An x-pipe will help a little but it won't eliminate it totally.

wfydaniel1990 · 02-20-2017, 10:12 AM

Quote:

Originally Posted by KillboyPowerhead

J-pipes do a great job of eliminating drone. I had a custom cat-back installed consisting of a "resonated x-pipe" by Magnaflow (part 11386) and then 2.5" pipe back (removed factory resonators and mufflers) and it droned a fair bit around 1700 - 2200 RPM or so, so I had j-pipes from Solo Performance added and the drone is almost gone, just a little bit around 1700 RPM, and even then it's much quieter. Solo Performance j-pipes are adjustable in length so you can "tune" them to find the right length to remove drone.

thank you, it's difficult to find a solo j pipe here in Beijing, because there're no official solo dealers in China. thanks any way i'll try to locate some used solo exhaust system, maybe i can find an axle-back by luck ~

wfydaniel1990 · 02-20-2017, 10:27 AM

Quote:

Originally Posted by Juiced1

If you can have them weld in some J-Pipes that would be your best bet. These always work to eliminate drone. An x-pipe will help a little but it won't eliminate it totally.

thank you， i think i'll probably go with the j-pipe solution, i;ll start looking for those tmr. does j-pipe give an extra torque in low rpm or it is solely designed to eliminate the drone ?

KillboyPowerhead · 02-20-2017, 01:06 PM

From what I've read j-pipes don't affect gas flow or sound (from the tail pipes) at all. The way they work is: a certain frequency range of sound waves causes drone, and the j-pipes are capped at the end which causes the sound waves to bounce back and cancel each other, thereby eliminating them and the drone.

The frequency of the sound waves that cause drone can differ with different exhaust piping, and there is likely a range for a few hundred RPM where the drone occurs, so by having adjustable j-pipes (like from Solo) you can "tune" them to what you need for your particular setup. If you can't get adjustable ones, you'll likely need about 36" long j-pipes for this car. I have my j-pipes as long as possible (about 1/16" from contacting something in either direction) and there is still a bit of drone, but it's reduced by about 90% or so I'd say.

02-19-2017, 10:12 PM	#1
wfydaniel1990 Drives: 15RS Join Date: Feb 2017 Location: China Posts: 9	Flowmaster AT catback drone HELP dear everyone, it's my first post on this forum , I'm a super fan of american muscle car(camaro to be exact) from Beijing. I have 1 set of flowmaster american thunder catback system (with outlaw mufflers) . after 2 months' travelling them finally arrived, after i put them on my car, the sound is marvellous and aggressive, but···· the resonance around 2k rpm is so obnoxious, it really drones a lot, i wonder if the flowmaster resonator can work with my exhaust system to kill the drone, even if i'll have to sacrifice 1/3 sound to get rid of the drone, i'll do it . BTW, my car is a 15 RS 3.6L with D/M mode V6. (the only version GM sells in China) . i'm kinda desperate now, it;s my daily driver, i drive 40km to my workplace on high way everyday... i really love the sound, hate the thought of giving it up... I wish everyone a happy chinese new year ~ Attached Images

02-20-2017, 05:50 AM	#5
Linker239 Drives: 2022 WC 2SS Join Date: Jan 2011 Location: Searcy, Arkansas Posts: 2,466 View My Garage	Magnaflow Resonated X pipe will solve most sound problems, however your going to loose a lot of volume. __________________ Current 2022 Wild Cherrry 2SS; Recaros, NPP, 5 Split Spoke Polished Rims, Satin Black Package Ordered 7-11-2023 1100: Riptide Blue 2SS, Not Built 2023 Red Hot 1LT RS V6; Sold 2010 VR 1LT RS; Sold

02-20-2017, 07:39 AM	#7
Hulk Drives: 2011 Synenergy Green 2SS/RS Join Date: Jan 2011 Location: Pueblo, Co Posts: 557	Generally on a V8 the x pipe will cackle a bit and a h pipe will be deeper sounding. I have the solo j pipe system on my V8 and it eliminates my drone but I am far form stock and I do not know if it will work with your system. The V6 guys will chime in and give you some guidance soon. Maybe drop the trans down a gear for now and increase the rpm at cruise to get you out of the 2000 rpm drone zone. __________________ 2011 Synenergy Green 2SS/RS Automatic.

02-20-2017, 09:53 AM	#10
Linker239 Drives: 2022 WC 2SS Join Date: Jan 2011 Location: Searcy, Arkansas Posts: 2,466 View My Garage	I'd try the res x-pipe first, I think that will solve it, J-Pipes would take out the drone for sure, but they may not fit as those mufflers take up quite a bit of space. They might fit, but it would take a lot of fab work, and I'd want them welded. __________________ Current 2022 Wild Cherrry 2SS; Recaros, NPP, 5 Split Spoke Polished Rims, Satin Black Package Ordered 7-11-2023 1100: Riptide Blue 2SS, Not Built 2023 Red Hot 1LT RS V6; Sold 2010 VR 1LT RS; Sold

02-19-2017, 10:15 PM	#2
wfydaniel1990 Drives: 15RS Join Date: Feb 2017 Location: China Posts: 9	HELP please

02-19-2017, 10:39 PM	#3
608RS Drives: 2015 2ss Join Date: Jun 2009 Location: . Posts: 645	happy chinese new year! since parts may be difficult to get since you're in China, why not head to a local exhaust shop? Maybe you can pickup a resonator and have them weld it on?

02-20-2017, 08:52 AM	#9
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 988	J-pipes do a great job of eliminating drone. I had a custom cat-back installed consisting of a "resonated x-pipe" by Magnaflow (part 11386) and then 2.5" pipe back (removed factory resonators and mufflers) and it droned a fair bit around 1700 - 2200 RPM or so, so I had j-pipes from Solo Performance added and the drone is almost gone, just a little bit around 1700 RPM, and even then it's much quieter. Solo Performance j-pipes are adjustable in length so you can "tune" them to find the right length to remove drone.

02-20-2017, 01:06 PM	#14
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 988	From what I've read j-pipes don't affect gas flow or sound (from the tail pipes) at all. The way they work is: a certain frequency range of sound waves causes drone, and the j-pipes are capped at the end which causes the sound waves to bounce back and cancel each other, thereby eliminating them and the drone. The frequency of the sound waves that cause drone can differ with different exhaust piping, and there is likely a range for a few hundred RPM where the drone occurs, so by having adjustable j-pipes (like from Solo) you can "tune" them to what you need for your particular setup. If you can't get adjustable ones, you'll likely need about 36" long j-pipes for this car. I have my j-pipes as long as possible (about 1/16" from contacting something in either direction) and there is still a bit of drone, but it's reduced by about 90% or so I'd say.