Can I add helmholtz after muffler? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Var · 09-06-2017, 09:09 PM

I just added the borla Cat-Back system to my car and along with the unequal length header and the catless front pipe the car drones a lot between 35 and 4500 RPM

There's not much room to work with since my front pipe has two resonators on it already. Is it possible to add a helmholtz chamber after the muffler or will that be of no use?

Spocknasty · 09-07-2017, 12:02 AM

I have the Borla catback and UEL Header with the factory front pipe. The drone is quite pronounced. I applied sound deadening mat to the trunk area to combat it, with noticeable effect.

Zee2413 · 09-07-2017, 12:09 PM

Quote:

Originally Posted by Spocknasty

I have the Borla catback and UEL Header with the factory front pipe. The drone is quite pronounced. I applied sound deadening mat to the trunk area to combat it, with noticeable effect.

Hey can you send some details of the sound deadening mats? I would love to get one as I have a 3" system catless and without any resonators. The Tomei type 80 is loud af

bababooey · 09-07-2017, 12:56 PM

google automotive sound deadening, there are numerous products. most familiar being a roll of insulation with sticky stuff on one side that you line the metal frame with. 'dynamat' being a popular brand, but not the only

Spocknasty · 09-07-2017, 10:34 PM

Quote:

Originally Posted by Zee2413

Hey can you send some details of the sound deadening mats? I would love to get one as I have a 3" system catless and without any resonators. The Tomei type 80 is loud af

I used Stinger RKX36B Roadkill Expert Series Sound Damping. Easy to apply, I recommend using a roller tool to ease and improve the application. I added some to the top of the area where the windshield meets the chassis to prevent rattles from a subwoofer as well, and that did the trick for that situation as well.

Var · 09-14-2017, 08:29 PM

Quote:

Originally Posted by Spocknasty

I used Stinger RKX36B Roadkill Expert Series Sound Damping. Easy to apply, I recommend using a roller tool to ease and improve the application. I added some to the top of the area where the windshield meets the chassis to prevent rattles from a subwoofer as well, and that did the trick for that situation as well.

Do you have any pics of your setup?

Spocknasty · 09-14-2017, 09:31 PM

Quote:

Originally Posted by Var

Do you have any pics of your setup?

I'll get some this weekend.

Timmy_Jones · 09-15-2017, 12:24 PM

Quote:

Originally Posted by Spocknasty

I'll get some this weekend.

Would like to see this, as well!

cbryant514 · 09-15-2017, 01:37 PM

Here is a nicely detailed thread post for trunk sound barrier installation:
http://www.ft86club.com/forums/showp...56&postcount=5

Scroll past the headliner portion to get to the the trunk portion. I plan to do my trunk this weekend in a similar fashion.

09-06-2017, 09:09 PM	#1
Var Senior Member Join Date: Feb 2017 Drives: 2017 Subaru BRZ PP Location: San Mateo, CA Posts: 157 Thanks: 45 Thanked 48 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Can I add helmholtz after muffler? I just added the borla Cat-Back system to my car and along with the unequal length header and the catless front pipe the car drones a lot between 35 and 4500 RPM There's not much room to work with since my front pipe has two resonators on it already. Is it possible to add a helmholtz chamber after the muffler or will that be of no use?

09-07-2017, 12:02 AM	#2
Spocknasty Member Join Date: Aug 2015 Drives: '13 BRZ Limited / 76' 914 1.8T Location: Philadelphia, PA Posts: 62 Thanks: 9 Thanked 33 Times in 19 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I have the Borla catback and UEL Header with the factory front pipe. The drone is quite pronounced. I applied sound deadening mat to the trunk area to combat it, with noticeable effect. __________________ Automotive photo and video www.mikespock.com

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09-07-2017, 12:56 PM	#4
bababooey Senior Member Join Date: Sep 2014 Drives: BRZ SWP Limited -6MT Location: HillCountry-TX Posts: 432 Thanks: 145 Thanked 162 Times in 106 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	google automotive sound deadening, there are numerous products. most familiar being a roll of insulation with sticky stuff on one side that you line the metal frame with. 'dynamat' being a popular brand, but not the only

09-15-2017, 01:37 PM	#9
cbryant514 Member Join Date: Apr 2017 Drives: 2016 Scion FR-S Location: Senoia, GA Posts: 56 Thanks: 73 Thanked 18 Times in 17 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Here is a nicely detailed thread post for trunk sound barrier installation: http://www.ft86club.com/forums/showp...56&postcount=5 Scroll past the headliner portion to get to the the trunk portion. I plan to do my trunk this weekend in a similar fashion.

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