How much sound will I lose?

Dbeckwith · 09-25-2015, 10:30 PM

Gotta switch out Kinetix high flow cats for the OEM cats, to Avoid burning out the HFC's. Exhaust currently sounds perfect, with the AAM 2.5" True Dual Exhaust. With changing out the HFC's, any idea how much sound am I going to lose? Trying to prep myself for it :-/ TIA

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G37Some · 09-26-2015, 11:37 AM

you will probably lose around 3 to 6 sound if i had to guess

Dbeckwith · 09-26-2015, 11:40 AM

Ok, thanks for the guess! I guess the flip side question is: is anyone running OEM cats with an open exhaust behind it? How does it sound?

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Dbeckwith · 10-02-2015, 09:34 AM

Well, I have my answer, Lost a lot of sound. The deep growl is gone :-(

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JARblue · 10-02-2015, 09:37 AM

OEM cats are the most restrictive part of the exhaust system. Dump them for test pipes and run open exhaust behind those

Dbeckwith · 10-02-2015, 09:39 AM

Since I'm still on Stillen canned Tune for the SC, I had to switch over to OEM cats. May see if I can pick up some Test Pipes to swap in, even though it'll lose some back-pressure (and therefore psi / HP from the SC).

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JARblue · 10-02-2015, 09:43 AM

I did not realize you were running a SC. If you go with TPs, you probably don't want open exhaust because of that back pressure loss.

Dbeckwith · 10-02-2015, 09:51 AM

Yeah, I've currently got AAM 2.5" true dual exhaust on it. Wondering how it'll sound with test pipes and that.

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TopgunZ · 10-02-2015, 11:08 AM

Take it from a guy that has been there done that. Get the Motordyne ART pipes if you want the sickest sounding exhaust. It is tame when it needs to but will put fear into people when you open her up with a supercharger blowing through it.

Also, I still cant believe the ridiculous misconception of "lets make backpressure for power". This is complete bs. Yes you will measure more boost on your gauge and if that is what you are after then go ahead. If you want power then open that sucker up. The more air you pull in the more needs to go out. The faster that can happen the more HP is created. Boost in the manifold is nothing more than restriction in the manifold.

Do you guys really think that's a good thing? Just get test pipes..... The ART sound the best. Unless you want rasp and possibly drone then get straight pipes. It sounds mean to some but I think its obnoxious. And your neighbors will hate you.

Dbeckwith · 10-02-2015, 11:17 AM

Quote:

Originally Posted by TopgunZ

Take it from a guy that has been there done that. Get the Motordyne ART pipes if you want the sickest sounding exhaust. It is tame when it needs to but will put fear into people when you open her up with a supercharger blowing through it.

Also, I still cant believe the ridiculous misconception of "lets make backpressure for power". This is complete bs. Yes you will measure more boost on your gauge and if that is what you are after then go ahead. If you want power then open that sucker up. The more air you pull in the more needs to go out. The faster that can happen the more HP is created. Boost in the manifold is nothing more than restriction in the manifold.

Do you guys really think that's a good thing? Just get test pipes..... The ART sound the best. Unless you want rasp and possibly drone then get straight pipes. It sounds mean to some but I think its obnoxious. And your neighbors will hate you.

Yes, totally makes sense on the total air flow/backpressure/HP note. Main reason i switched for now was to save the HFC's until i get re-tuned and get rid of Stillen's super rich ratio that could ruin em. Keeping the HFC's in the garage for now, will likely put em back up when i get re-tuned sometime next year.

TopgunZ · 10-02-2015, 11:20 AM

You can still melt those HFC's. If that happens you will not only be out of a set of them but you could also pop your motor. In fact, the OEM cats have shown to hold up better than HFC's so why would you put those back on? If its all for sound then get a cheap set of test pipes and be done with it. By cheap I mean test pipes are cheap in general but ART pipes are a little spendy, but well, well worth it.

Dbeckwith · 10-02-2015, 11:23 AM

Quote:

Originally Posted by TopgunZ

You can still melt those HFC's. If that happens you will not only be out of a set of them but you could also pop your motor. In fact, the OEM cats have shown to hold up better than HFC's so why would you put those back on? If its all for sound then get a cheap set of test pipes and be done with it. By cheap I mean test pipes are cheap in general but ART pipes are a little spendy, but well, well worth it.

Ok, good to know. Thanks!

Quote:

Originally Posted by TopgunZ

You can still melt those HFC's. If that happens you will not only be out of a set of them but you could also pop your motor. In fact, the OEM cats have shown to hold up better than HFC's so why would you put those back on? If its all for sound then get a cheap set of test pipes and be done with it. By cheap I mean test pipes are cheap in general but ART pipes are a little spendy, but well, well worth it.

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FPenvy · 10-02-2015, 12:26 PM

Quote:

Originally Posted by JARblue

OEM cats are the most restrictive part of the exhaust system. Dump them for test pipes and run open exhaust behind those

I know how that goes

birdman71 · 10-02-2015, 12:38 PM

I will soon have Resonated Test Pipes from FI on my FI exhaust system with 18in Res and Carbon Fiber mufflers for street use. For meetup and show use I'm going to swap the mufflers for custom muffler deleted polished tails. talk about roar down the street while going slow hahah

09-25-2015, 10:30 PM	#1 (permalink)
Dbeckwith Base Member Join Date: Jul 2015 Location: West Lafayette, IN Posts: 107 Drives: 2010 370z Roadster Rep Power: 9	How much sound will I lose? Gotta switch out Kinetix high flow cats for the OEM cats, to Avoid burning out the HFC's. Exhaust currently sounds perfect, with the AAM 2.5" True Dual Exhaust. With changing out the HFC's, any idea how much sound am I going to lose? Trying to prep myself for it :-/ TIA Sent from my A0001 using Tapatalk

09-26-2015, 11:37 AM	#2 (permalink)
G37Some Base Member Join Date: Apr 2014 Location: Tampa, FL Posts: 144 Drives: 2008 G37s Rep Power: 11	you will probably lose around 3 to 6 sound if i had to guess zguynate and Dbeckwith like this. __________________ instagram : @TurboG37

10-02-2015, 09:34 AM	#4 (permalink)
Dbeckwith Base Member Join Date: Jul 2015 Location: West Lafayette, IN Posts: 107 Drives: 2010 370z Roadster Rep Power: 9	Well, I have my answer, Lost a lot of sound. The deep growl is gone :-( Sent from my A0001 using Tapatalk birdman71 likes this.

10-02-2015, 09:37 AM	#5 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,449 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	OEM cats are the most restrictive part of the exhaust system. Dump them for test pipes and run open exhaust behind those Dbeckwith likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

10-02-2015, 09:43 AM	#7 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,449 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	I did not realize you were running a SC. If you go with TPs, you probably don't want open exhaust because of that back pressure loss. Dbeckwith likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

09-26-2015, 11:40 AM	#3 (permalink)
Dbeckwith Base Member Join Date: Jul 2015 Location: West Lafayette, IN Posts: 107 Drives: 2010 370z Roadster Rep Power: 9	Ok, thanks for the guess! I guess the flip side question is: is anyone running OEM cats with an open exhaust behind it? How does it sound? Sent from my A0001 using Tapatalk

10-02-2015, 09:39 AM	#6 (permalink)
Dbeckwith Base Member Join Date: Jul 2015 Location: West Lafayette, IN Posts: 107 Drives: 2010 370z Roadster Rep Power: 9	Since I'm still on Stillen canned Tune for the SC, I had to switch over to OEM cats. May see if I can pick up some Test Pipes to swap in, even though it'll lose some back-pressure (and therefore psi / HP from the SC). Sent from my A0001 using Tapatalk

10-02-2015, 09:51 AM	#8 (permalink)
Dbeckwith Base Member Join Date: Jul 2015 Location: West Lafayette, IN Posts: 107 Drives: 2010 370z Roadster Rep Power: 9	Yeah, I've currently got AAM 2.5" true dual exhaust on it. Wondering how it'll sound with test pipes and that. Sent from my A0001 using Tapatalk

10-02-2015, 11:08 AM	#9 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6833	Take it from a guy that has been there done that. Get the Motordyne ART pipes if you want the sickest sounding exhaust. It is tame when it needs to but will put fear into people when you open her up with a supercharger blowing through it. Also, I still cant believe the ridiculous misconception of "lets make backpressure for power". This is complete bs. Yes you will measure more boost on your gauge and if that is what you are after then go ahead. If you want power then open that sucker up. The more air you pull in the more needs to go out. The faster that can happen the more HP is created. Boost in the manifold is nothing more than restriction in the manifold. Do you guys really think that's a good thing? Just get test pipes..... The ART sound the best. Unless you want rasp and possibly drone then get straight pipes. It sounds mean to some but I think its obnoxious. And your neighbors will hate you. Dbeckwith likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

10-02-2015, 11:20 AM	#11 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6833	You can still melt those HFC's. If that happens you will not only be out of a set of them but you could also pop your motor. In fact, the OEM cats have shown to hold up better than HFC's so why would you put those back on? If its all for sound then get a cheap set of test pipes and be done with it. By cheap I mean test pipes are cheap in general but ART pipes are a little spendy, but well, well worth it. Dbeckwith likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

10-02-2015, 12:38 PM	#14 (permalink)
birdman71 A True Z Fanatic Join Date: Apr 2015 Location: Los Angeles, CA Posts: 1,579 Drives: People Crazy! Rep Power: 40	I will soon have Resonated Test Pipes from FI on my FI exhaust system with 18in Res and Carbon Fiber mufflers for street use. For meetup and show use I'm going to swap the mufflers for custom muffler deleted polished tails. talk about roar down the street while going slow hahah Dbeckwith likes this. __________________ *Birdman's Build:* Powerhouse Amuse/ Nismo/ Eibach/ ACT/ Tommy Kaira/ Avant Garde/ Fast Intentions/ Project Kics/ Fly 1 Motorsports/ EVO-R/ Z1 Motorsports/ Weber Sports/ Zoom/ Zele Japan

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