Rear Seat Delete with exhaust noise?

gcrusco · 05-07-2019, 10:42 PM

Getting ready to do rollbar with rear seat delete kit through Garage Therapy NC, and am curious about additional noise when removing the rear bench seat?

Has anyone experience increased noise. I have a full system ARH Catless headers to mid pipes and Corsa Extreme axle back. Already the loudest car I have been in. How much if any additional noise will be expected with a rear seat delete kit?

Smokin19 · 05-08-2019, 05:34 AM

Thought about doing the same. If I do, I will adding some sound deadening to the rear area and trunk.

DangerZL1 · 05-08-2019, 07:52 AM

If you want to get a close idea to how much noise you’ll get, just fold the rear seats down and drive around.

MP3BOOSTED · 05-08-2019, 08:33 AM

I run kooks 2' inch headers / off road connection pipes and mbrp race catback exhaust while being cammed and it isn't bad at all. just depends if the car is your daily i guess and if you like hearing those bald eagles leaving your exhaust tips

gcrusco · 05-08-2019, 09:23 AM

Quote:

Originally Posted by DangerZL1

If you want to get a close idea to how much noise you’ll get, just fold the rear seats down and drive around.

True will try that this weekend appreciate it.

gcrusco · 05-08-2019, 09:24 AM

Quote:

Originally Posted by MP3BOOSTED

I run kooks 2' inch headers / off road connection pipes and mbrp race catback exhaust while being cammed and it isn't bad at all. just depends if the car is your daily i guess and if you like hearing those bald eagles leaving your exhaust tips

Awesome doesn't bother me at all whats a radio anyways

breakskeet · 05-08-2019, 10:24 AM

You could consider buying the Shrader back seat elimination kit and put sound deadener on the underside and back of it. That may work for you.

DangerZL1 · 05-08-2019, 12:19 PM

I read a post a month or so ago where the ZL1 owner commented how much quieter his car was after adding sound deadener and an after market trunk mat on top of the existing one. I'm pretty sure this was with the rear seat in place. He estimated a 10db reduction, which is substantial.

Even with sound deadening the trunk will become an echo chamber for the exhaust and road noise from the rear wheel wells. The seat bottoms and backs make a tremendous difference in noise reduction.

Cooter42 · 05-08-2019, 02:57 PM

GT did my cage and rear seat delete. No noticeable increase in sound level IMO - but I haven’t been that focused on it. GT does great work!

gcrusco · 05-09-2019, 02:06 PM

Quote:

Originally Posted by Cooter42

GT did my cage and rear seat delete. No noticeable increase in sound level IMO - but I haven’t been that focused on it. GT does great work!

Appreciate it. Thanks!

SFV1LE · 05-09-2019, 02:25 PM

Completely different platform, but only experience I have was when I once briefly removed the simple thick foam rear bench in my Evo 8 while working on the fuel system, and drove it around the neighborhood testing before replacing everything.

The noise increase was remarkable, the way every engine and road noise was transmitted and amplified in the cabin it almost sounded like I had removed the sheet metal under the seat as well. It sounded terrible.

05-07-2019, 10:42 PM	#1
gcrusco Drives: 2018 ZL1 1LE, 2014 ZL1 Join Date: Jul 2017 Location: Austin Texas Posts: 116	Rear Seat Delete with exhaust noise? Getting ready to do rollbar with rear seat delete kit through Garage Therapy NC, and am curious about additional noise when removing the rear bench seat? Has anyone experience increased noise. I have a full system ARH Catless headers to mid pipes and Corsa Extreme axle back. Already the loudest car I have been in. How much if any additional noise will be expected with a rear seat delete kit?

05-08-2019, 05:34 AM	#2
Smokin19 Drives: 19' ZL1 A10, w/pdr Join Date: Sep 2014 Location: S.W. ohio Posts: 1,722	Thought about doing the same. If I do, I will adding some sound deadening to the rear area and trunk. __________________ BTR Stg II cam w/ 38% fuel lobe, ARH 2" headers into 3" w/Gesi cats, Kong X port, Weapon X triple ht exchangers, NW 103, Rotofab big gulp, DSX lowside, TCM tune, BMR Lockout, Mustang dyno 720 rwhp, 634 rwtq on 93 pump.

05-08-2019, 08:33 AM	#4
MP3BOOSTED Drives: 2017 Camaro SS 1LE (F1A-94 FBO H/C) Join Date: Jun 2017 Location: San Antonio Texas Posts: 844	I run kooks 2' inch headers / off road connection pipes and mbrp race catback exhaust while being cammed and it isn't bad at all. just depends if the car is your daily i guess and if you like hearing those bald eagles leaving your exhaust tips __________________ Performance Mods: F1A-94, DSX Flex Fuel Kit, MSD Spark Plug Wires, KOOK 2" off road headers, MBRP Race catback exhaust, Pray Performance Custom Boost Cam, Rocker Arm Trunion Upgrade Kit, 7.850" Hardened Chromemoly Length Pushrods and Johnson Racing 2110R Lifters, TSP CNC'd Heads, Ported MSD intake manifold, 103mm Katech Throttle body, Forged Pistons/Rods, RPM Meth kit, DSX Aux Fuel system, AEM Failsafe and banks gauge, LT4 HPFP, LT4 injectors, BMR motor mounts, Hurst Short Throw, Manley SS exhaust valves Videos of my car? Check here: https://www.youtube.com/channel/UCNi...Qy1OL4NVGlPogw

05-08-2019, 07:52 AM	#3
DangerZL1 Drives: 2023 Black ZL1 Auto Join Date: Oct 2009 Location: FEMA Region 4 Posts: 2,936	If you want to get a close idea to how much noise you’ll get, just fold the rear seats down and drive around.

05-08-2019, 10:24 AM	#7
breakskeet Kevin Drives: 2018 Callaway Camaro ZL1 1LE Join Date: Apr 2018 Location: Rattlesnake, FL Posts: 321	You could consider buying the Shrader back seat elimination kit and put sound deadener on the underside and back of it. That may work for you.

05-08-2019, 12:19 PM	#8
DangerZL1 Drives: 2023 Black ZL1 Auto Join Date: Oct 2009 Location: FEMA Region 4 Posts: 2,936	I read a post a month or so ago where the ZL1 owner commented how much quieter his car was after adding sound deadener and an after market trunk mat on top of the existing one. I'm pretty sure this was with the rear seat in place. He estimated a 10db reduction, which is substantial. Even with sound deadening the trunk will become an echo chamber for the exhaust and road noise from the rear wheel wells. The seat bottoms and backs make a tremendous difference in noise reduction.

05-08-2019, 02:57 PM	#9
Cooter42 Drives: ZL1 1LE Join Date: Aug 2018 Location: Oregon Posts: 28	GT did my cage and rear seat delete. No noticeable increase in sound level IMO - but I haven’t been that focused on it. GT does great work!

05-09-2019, 02:25 PM	#11
SFV1LE Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018 Location: CA Posts: 1,365	Completely different platform, but only experience I have was when I once briefly removed the simple thick foam rear bench in my Evo 8 while working on the fuel system, and drove it around the neighborhood testing before replacing everything. The noise increase was remarkable, the way every engine and road noise was transmitted and amplified in the cabin it almost sounded like I had removed the sheet metal under the seat as well. It sounded terrible.

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