Exhaust Valve Bypass - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

francone13 · 04-11-2009, 06:44 PM

What does everyone think about installing one of these?

http://www.dmhperformance.com/

NightmareSS · 04-11-2009, 07:12 PM

i cant wait to get one...

cam2fst4u · 04-11-2009, 07:14 PM

speakers are crappy but i think i would have to hear it in real life

francone13 · 04-11-2009, 07:15 PM

wondering how legal it would b lol

Vash · 04-11-2009, 07:20 PM

Only if your building an offroad racer. Will void your engine warranty and it not street legal.

It's a bad idea for a new car.

Evotion · 04-11-2009, 07:23 PM

Never had one personally.

As with all exhaust cutouts they are subject to local laws... I know here they are not illegal as long as the are manually operated, i.e. not vacuum or electronically controled. As for sound, depending on where they are placed, they sounds like open exhaust. If you will be racing they are fine, although with newer cars with little to no mods, they might actually hurt performance. For the 99% of the time you aren't at the track, I would stick with an aftermarket catback.

cam2fst4u · 04-11-2009, 07:24 PM

cops around here would write you up in a heartbeat. According to the law any modification to the exhaust system is illegal

Vash · 04-11-2009, 07:29 PM

GM has addressed lot of the bottlenecks with emissions. Both engines would not have good HP without a good flowing intake and exhaust. It's not a performance bottleneck like it was back in the day.

francone13 · 04-11-2009, 07:31 PM

Thanks guys...im probably gonna stick wit an after market cat back

*CamaroSpike23* · 04-11-2009, 07:42 PM

exhaust valve bypass.... never heard a cutout called that before.

gunslinger · 04-11-2009, 07:49 PM

Once again, the only problem with these is the possibility of the motor getting burnt out and issues with it sealing properly when closed.

The main problem is that the driver has no way to tell when the butterfly is closed and will continue to hold the switch in the 'Close' position even after the butterfly has made contact, thus overloading the electric motor.

They work great for a while, but eventually they will burn out unless they have an automatic sensor that stops the current when the valve is closed.

I think either going with a regular cutout with the wing nuts or a cable operated version is a little more reliable...(or maybe making a setup like they have on the Vette using the GM parts)

Boogie832 · 04-11-2009, 08:16 PM

I can speak with experience.

I have electric cutouts on my '67 Camaro. The style you are listing has it share of sticking problems. Over time, You'll find you will find that you have to work them by hand while opening and shuting them repeatly with the button to un-stick them. The butterfly style just seems to build up carbon real bad. Sometimes only one side will open (or close) and you won't like the sound of that! If your going to get them, then spend the extra money and get the "DOUGS". They are built to last much longer. You will enjoy them much better than "any others out there", because they are built with a "Rack and pinion drive mechanism".

Be prepared for the price though!

This is a much better performing set. Follow the link below for a set of "Doug's 304 Stainless Steel Electric Exhaust Cutouts".

http://www.jegs.com/p/Doug%27s+Headers/759640/10002/-1

*CamaroSpike23* · 04-11-2009, 08:25 PM

Quote:

Originally Posted by Boogie832

I can speak with experience.

I have electric cutouts on my '67 Camaro. The style you are listing has it share of sticking problems. Over time, You'll find you will find that you have to work them by hand while opening and shuting them repeatly with the button to un-stick them. The butterfly style just seems to build up carbon real bad. Sometimes only one side will open (or close) and you won't like the sound of that! If your going to get them, then spend the extra money and get the "DOUGS". They are built to last much longer. You will enjoy them much better than "any others out there", because they are built with a "Rack and pinion drive mechanism".

Be prepared for the price though!

This is a much better performing set. Follow the link below for a set of "Doug's 304 Stainless Steel Electric Exhaust Cutouts".

http://www.jegs.com/p/Doug%27s+Headers/759640/10002/-1

to the Doug's cutouts. they rock all night long.

but they are expeeeeeeeeensive.

detroitboy · 04-11-2009, 09:12 PM

Which brand is it that closes the opening to the tailpipes at the same time it opens the cutout? It also can be dialed in to partial openings. I read it somewhere on these posts but did not write down the name of the manufacturer.

04-11-2009, 06:44 PM	#1
francone13 Drives: 2010 Camaro 2LT/RS Join Date: Nov 2008 Location: Toronto Posts: 280	Exhaust Valve Bypass What does everyone think about installing one of these? http://www.dmhperformance.com/

04-11-2009, 07:12 PM	#2
NightmareSS Drives: 2010 Camaro SS/RS 92 300zx 2001 Ram Join Date: Feb 2009 Location: Staten Island, NYC Posts: 1,388	i cant wait to get one... __________________

04-11-2009, 07:49 PM	#11
gunslinger Drives: 1998 Z28 M6 Join Date: May 2008 Location: Lake Forest, CA Posts: 254	Once again, the only problem with these is the possibility of the motor getting burnt out and issues with it sealing properly when closed. The main problem is that the driver has no way to tell when the butterfly is closed and will continue to hold the switch in the 'Close' position even after the butterfly has made contact, thus overloading the electric motor. They work great for a while, but eventually they will burn out unless they have an automatic sensor that stops the current when the valve is closed. I think either going with a regular cutout with the wing nuts or a cable operated version is a little more reliable...(or maybe making a setup like they have on the Vette using the GM parts) __________________ GTR: Get Transmission Replaced

04-11-2009, 08:16 PM	#12
Boogie832 12-08-08 Arrived 06-02-09 Drives: 1967 Camaro Richmond5-speed Join Date: Jan 2009 Location: Bartow FL Posts: 183 View My Garage	I can speak with experience. I have electric cutouts on my '67 Camaro. The style you are listing has it share of sticking problems. Over time, You'll find you will find that you have to work them by hand while opening and shuting them repeatly with the button to un-stick them. The butterfly style just seems to build up carbon real bad. Sometimes only one side will open (or close) and you won't like the sound of that! If your going to get them, then spend the extra money and get the "DOUGS". They are built to last much longer. You will enjoy them much better than "any others out there", because they are built with a "Rack and pinion drive mechanism". Be prepared for the price though! This is a much better performing set. Follow the link below for a set of "Doug's 304 Stainless Steel Electric Exhaust Cutouts". http://www.jegs.com/p/Doug%27s+Headers/759640/10002/-1 __________________ Ordered 2SS/RS IOM,12/08/08. Arrived at Dealer 06-02-09 Brought Home! 06-09-09

04-11-2009, 09:12 PM	#14
detroitboy Pinholic Drives: 11 Silverado, 08 Shelby GT500 Conv. Join Date: Nov 2008 Location: Macomb, Mi Posts: 698	Which brand is it that closes the opening to the tailpipes at the same time it opens the cutout? It also can be dialed in to partial openings. I read it somewhere on these posts but did not write down the name of the manufacturer. __________________ Almost had a 2SS/RS, IOM, orange accent interior, 6 speed manual, sunroof & polished wheels ordered 01/19/07 3000 - 2/27/09 3400 - 3/27/09 3800 - 4/17/09 (built and lost in the vortex) ship date ??????? (I gave up and got a GT500) 5/11/09 - order cancelled 5/27/09 - vehicle arrived at dealership for whoever bought it after me

04-11-2009, 07:14 PM	#3
cam2fst4u Drives: 08 SS trailblazer,08 Silverado Join Date: Mar 2009 Location: stanley va Posts: 6,268 View My Garage	speakers are crappy but i think i would have to hear it in real life

04-11-2009, 07:15 PM	#4
francone13 Drives: 2010 Camaro 2LT/RS Join Date: Nov 2008 Location: Toronto Posts: 280	wondering how legal it would b lol

04-11-2009, 07:20 PM	#5
Vash Drives: 00 Blazer Join Date: Aug 2008 Location: Texas Posts: 5,104	Only if your building an offroad racer. Will void your engine warranty and it not street legal. It's a bad idea for a new car.

04-11-2009, 07:23 PM	#6
Evotion Warehouse 13 Survivor!!!! Drives: '13 ZL1 - 69' Camaro Join Date: Sep 2008 Location: Tucson, AZ Posts: 802 View My Garage	Never had one personally. As with all exhaust cutouts they are subject to local laws... I know here they are not illegal as long as the are manually operated, i.e. not vacuum or electronically controled. As for sound, depending on where they are placed, they sounds like open exhaust. If you will be racing they are fine, although with newer cars with little to no mods, they might actually hurt performance. For the 99% of the time you aren't at the track, I would stick with an aftermarket catback.

04-11-2009, 07:24 PM	#7
cam2fst4u Drives: 08 SS trailblazer,08 Silverado Join Date: Mar 2009 Location: stanley va Posts: 6,268 View My Garage	cops around here would write you up in a heartbeat. According to the law any modification to the exhaust system is illegal

04-11-2009, 07:29 PM	#8
Vash Drives: 00 Blazer Join Date: Aug 2008 Location: Texas Posts: 5,104	GM has addressed lot of the bottlenecks with emissions. Both engines would not have good HP without a good flowing intake and exhaust. It's not a performance bottleneck like it was back in the day.

04-11-2009, 07:31 PM	#9
francone13 Drives: 2010 Camaro 2LT/RS Join Date: Nov 2008 Location: Toronto Posts: 280	Thanks guys...im probably gonna stick wit an after market cat back

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