Exhaust flapper mod? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

spicetooth · 01-05-2019, 12:52 PM

Love my UEL and r400 but it wakes my kids up and shakes my neighbors (who I like) out of bed.

Looking for something I believe is called a flapper mod or dampening flap.

Basically, you push a button or pull a cable and your exhaust is restricted.

This way I can leave and return home quietly.

Any ideas?

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Leonardo · 01-05-2019, 12:58 PM

Back in the day, I had a custom exhaust built with a "butterfly" valve. It was activated by a lever under the driver seat. I could open and close it while driving.

A performance shop my buddy owned put the whole thing together for me.

It went from loud to CRAZY LOUD!

It was on the accord.

I was 19... Going broke building these...

Edit: google this to find what you are looking for. "exhaust butterfly valve"

ls1ac · 01-05-2019, 02:15 PM

If you can give up a small amount of power, put a "Car Chemistry" insert in one side and a cutoff in the other. The insert has very little restriction and with all the gas going through it should help cut down the sound. With the cut off open you should have most of the noise back.
We have had to use these inserts at tracks that have imposed sound level requirement.

humfrz · 01-05-2019, 02:25 PM

Quote:

Originally Posted by Leonardo

Back in the day, I had a custom exhaust built with a "butterfly" valve. It was activated by a lever under the driver seat. I could open and close it while driving.

Further back in the day, we called them cut-outs. Cut into the exhaust pipe of a big block Chevrolet V-8 and weld them in.

When you pulled the cables and opened those puppies up, dumping the exhaust right under the car - the lyric from the movie/song "Thunder Road" took on meaning -

humfrz

churchx · 01-05-2019, 03:00 PM

IIRC electric actuated cutouts that can be welded on exhaust are plentiful on eg. ebay. I'd probably prefer cable actuated one though, for simplicity/decreased failure possibiliity/cheaper price.

Irace86.2.0 · 01-05-2019, 03:10 PM

There are cheap units and expensive units. If you want to save some money you might be able to buy a stock Mustang GT muffler/pipe and actuator then run wires back to some switches in the dash.

ls1ac · 01-05-2019, 03:36 PM

Check Summit, Jegs, and Hooker for cut out and exhaust control.

spicetooth · 01-05-2019, 04:36 PM

So far, if a custom shop hooks me up I'm around 800 canadian!

$190 Y pipe with valve and electronics
$200 muffler and other pipes
$300 to 400 labour

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x808drifter · 01-05-2019, 05:43 PM

Exhaust Flapper???

spicetooth · 01-05-2019, 05:47 PM

Lol

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jflogerzi · 01-08-2019, 12:20 AM

Revworks I believe has this just launched with a new exhaust and the feature you are wanting. Not sure on how it sounds etc...

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01-05-2019, 12:52 PM	#1
spicetooth Member Join Date: Aug 2014 Drives: 2014 FR-S Location: Ottawa, ON CAN Posts: 28 Thanks: 8 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s)	Exhaust flapper mod? Love my UEL and r400 but it wakes my kids up and shakes my neighbors (who I like) out of bed. Looking for something I believe is called a flapper mod or dampening flap. Basically, you push a button or pull a cable and your exhaust is restricted. This way I can leave and return home quietly. Any ideas? Sent from my ONEPLUS A6013 using Tapatalk

01-05-2019, 12:58 PM	#2
Leonardo Country Boy 4 Life Join Date: Jul 2012 Drives: 19' & 06' Ridgelines, 13' FR-S Location: EUGENE Posts: 5,228 Thanks: 6,719 Thanked 5,293 Times in 2,720 Posts Mentioned: 47 Post(s)	Back in the day, I had a custom exhaust built with a "butterfly" valve. It was activated by a lever under the driver seat. I could open and close it while driving. A performance shop my buddy owned put the whole thing together for me. It went from loud to CRAZY LOUD! It was on the accord. I was 19... Going broke building these... Edit: google this to find what you are looking for. "exhaust butterfly valve" __________________ I LIKE TIRES! Last edited by Leonardo; 01-05-2019 at 01:11 PM.

01-05-2019, 03:10 PM	#6
Irace86.2.0 Senior Member Join Date: Mar 2017 Drives: Q5 + BRZ + M796 Location: Santa Rosa, CA Posts: 7,884 Thanks: 5,668 Thanked 5,812 Times in 3,302 Posts Mentioned: 70 Post(s)	There are cheap units and expensive units. If you want to save some money you might be able to buy a stock Mustang GT muffler/pipe and actuator then run wires back to some switches in the dash. __________________ My Build \| K24 Turbo Swap \| K24T BRZ SOLD

01-08-2019, 12:20 AM	#11
jflogerzi Senior Member Join Date: May 2012 Drives: 2013 Series 10 6MT FR-S Location: Moreno Valley, CA Posts: 5,565 Thanks: 2,013 Thanked 2,043 Times in 1,474 Posts Mentioned: 72 Post(s)	Revworks I believe has this just launched with a new exhaust and the feature you are wanting. Not sure on how it sounds etc... Sent from my ONEPLUS A5010 using Tapatalk __________________ 2013 Series 10 FRS #553 RCE T2's, SPC LCAs -4/2.6 camber JDL 4-2-1 EL, FP and OP, Tuned by Zach@CSG on e85 RR Wilwood Front/Rear Sport BBK, Motul 600 Fluid ARC-8 17x9 SX2 GTs 245s/Koing 17x8 v730's 225's

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01-05-2019, 02:15 PM	#3
ls1ac Senior Member Join Date: Oct 2013 Drives: BRZ, Noble M400, AC-LS7,1956 AC Location: Wi/Fl Posts: 1,022 Thanks: 328 Thanked 867 Times in 471 Posts Mentioned: 7 Post(s)	If you can give up a small amount of power, put a "Car Chemistry" insert in one side and a cutoff in the other. The insert has very little restriction and with all the gas going through it should help cut down the sound. With the cut off open you should have most of the noise back. We have had to use these inserts at tracks that have imposed sound level requirement.

01-05-2019, 03:00 PM	#5
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,336 Thanks: 698 Thanked 2,091 Times in 1,437 Posts Mentioned: 53 Post(s)	IIRC electric actuated cutouts that can be welded on exhaust are plentiful on eg. ebay. I'd probably prefer cable actuated one though, for simplicity/decreased failure possibiliity/cheaper price.

01-05-2019, 03:36 PM	#7
ls1ac Senior Member Join Date: Oct 2013 Drives: BRZ, Noble M400, AC-LS7,1956 AC Location: Wi/Fl Posts: 1,022 Thanks: 328 Thanked 867 Times in 471 Posts Mentioned: 7 Post(s)	Check Summit, Jegs, and Hooker for cut out and exhaust control.

01-05-2019, 04:36 PM	#8
spicetooth Member Join Date: Aug 2014 Drives: 2014 FR-S Location: Ottawa, ON CAN Posts: 28 Thanks: 8 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s)	So far, if a custom shop hooks me up I'm around 800 canadian! $190 Y pipe with valve and electronics $200 muffler and other pipes $300 to 400 labour Sent from my ONEPLUS A6013 using Tapatalk

01-05-2019, 05:43 PM	#9
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,650 Times in 1,625 Posts Mentioned: 15 Post(s)	Exhaust Flapper???

01-05-2019, 05:47 PM	#10
spicetooth Member Join Date: Aug 2014 Drives: 2014 FR-S Location: Ottawa, ON CAN Posts: 28 Thanks: 8 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s)	Lol Sent from my ONEPLUS A6013 using Tapatalk

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