Christmas present for me - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Lou gill · 12-09-2023, 08:33 AM

Hey group, I have ‘13 ZL1 convertible and I am looking to install exhaust cutouts, what is everyone using or recommending, I have an excellent mechanic who can weld if needed.

Merry Christmas

1JEWLDSSRS · 12-09-2023, 09:24 AM

I run these on my 2011 Camaro SS, and they will work on your Camaro. I got mine from Summit Racing though.

https://quicktimeperformance.com/i-3...Csubmodel%3DSS

Not my car, but exactly the same setup..

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George-CZ · 12-09-2023, 10:31 AM

It is absolutely useless, but it's great

QTP certainly
I control using the door opening buttons near the rearview mirror.

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bsn · 12-09-2023, 12:56 PM

I am not aware of anyone making a ready to go cutout for a ZL1 convertible due to the extra bracing. Any good welder can make something that will work. I am in the middle of fabricating some for my for my ZL1 convertible, I went with mechanical boost operated valves that open at 2lbs of boost with metal tubing getting pressure using the map sensor with a DMS adapter. I also have the tubing for the cutout pointed to the front at a 40 degree angle so when the valve is closed during normal cruising you don't have reversion as you get with anything at a 90 degrees or less facing rearward. You can also use electric valves instead of mechanical but they don't tend to be as reliable.

Little Walter · 12-09-2023, 10:32 PM

Good noise maker, but no horsepower gain of any significance, maybe 2 horsepower at the most if that, but makes for some good loud sound.

Rob3D · 12-09-2023, 11:49 PM

For what it’s worth, maybe skip the cutouts and install NOWEEDS. You’ll be much happier in the long run. And because they’re diverters they sound so much better than cutouts!

bsn · 12-10-2023, 09:02 AM

Its been proven on a blown car a cutout can add HP if the exhaust system is somewhat restrictive, on a N/A car there is little or no gain. With the valve closed they generally rob a few HP due to reversion, that is why I am trying a reverse Y it will act as an expansion chamber when closed and blow off excess back pressure when open. I am pretty sure I will pick up a measurable bit of HP open and not lose and maybe even pick up a minute amount of HP closed.

SlowLS1 · 12-10-2023, 09:22 AM

Hey bsn, where did you source that particular mechanical boost operated cutout?

bsn · 12-10-2023, 10:53 AM

This is what I am using and have used in the past
https://www.ebay.com/itm/234383713163
You can find them on Amazon or google it. No matter where you buy them, I think they are all coming from the same manufacturer. The quality is very good, if you're running much boost don't use a rubber line use a hard line like what is used on air suspension or metal 3/16" line. The nipples are 6mm so I am using 3/16 compression fittings with one side drilled out to 6mm-instead of the ferrell I am using a nitrile o ring. Can't pull it out by hand when tightened so should hold up fine under boost.

SlowLS1 · 12-10-2023, 11:05 AM

Quote:

Originally Posted by bsn

This is what I am using and have used in the past
https://www.ebay.com/itm/234383713163
You can find them on Amazon or google it. No matter where you buy them, I think they are all coming from the same manufacturer. The quality is very good, if you're running much boost don't use a rubber line use a hard line like what is used on air suspension or metal 3/16" line. The nipples are 6mm so I am using 3/16 compression fittings with one side drilled out to 6mm-instead of the ferrell I am using a nitrile o ring. Can't pull it out by hand when tightened so should hold up fine under boost.

This is exactly what I am looking for, open under boost. Being as I am also on air, I could tie in an override from my existing air system with regulator.

Mr V · 12-10-2023, 12:01 PM

Just from what I have read on the forums here, people seem to have a better opinion on the Noweeds vs QTP. More people complaining of failures with QTP. I was looking at using something like the BMR brace to see if that would allow Noweeds to work on a convertible. I may have to go the welding route if I decide to get them though. If anyone has a convertible with Noweeds would like to hear what they had to do.

*mlee* · 12-10-2023, 12:37 PM

Quote:

Originally Posted by George-CZ

It is absolutely useless, but it's great

I love this^^^

spyderbuddy · 12-10-2023, 04:04 PM

not much for me but i Got a Set of Headlight covers for the 2010

https://youtu.be/gSvfWD8MFxU

1JEWLDSSRS · 12-10-2023, 04:14 PM

Quote:

Originally Posted by spyderbuddy

not much for me but i Got a Set of Headlight covers for the 2010

https://youtu.be/gSvfWD8MFxU

Man that guy in the vid has one hell of a time!! They are not that hard! I had them. Pop in, pop out... lol.

12-09-2023, 08:33 AM	#1
Lou gill Drives: ‘13 ZL1 convertible Join Date: Mar 2014 Location: Mad City WI Posts: 176 View My Garage	Christmas present for me Hey group, I have ‘13 ZL1 convertible and I am looking to install exhaust cutouts, what is everyone using or recommending, I have an excellent mechanic who can weld if needed. Merry Christmas

12-09-2023, 09:24 AM	#2
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,449	I run these on my 2011 Camaro SS, and they will work on your Camaro. I got mine from Summit Racing though. https://quicktimeperformance.com/i-3...Csubmodel%3DSS Not my car, but exactly the same setup.. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

12-09-2023, 10:31 AM	#3
George-CZ Drives: 2010 2SS LS3 and 1978 STROKER 383 Join Date: Feb 2018 Location: Czech Republic Posts: 1,592	It is absolutely useless, but it's great QTP certainly I control using the door opening buttons near the rearview mirror. __________________ My life is a constant struggle with Camaro. K&N CAI, Stainless Power longtubes, high flow cats, modified Ragazzon High Performance axle back, Soler Performance ported throttle body, Soler Performance throttle controller, RAM clutch adjuster, modified LS7 clutch kit, Tick Performance billet bearing support, Tick Performance remote bleeder, separate clutch reservoir, BMR trailing arms, BMR toe rods, Pedders Suspension cradle bushing inserts, Control Arm Bushings, Strut tower brace, oil catch can, Hurst T-handle shifter, 20mm wheel spacers, DBA brakes, QTP Cutouts, Dynosteve tune.

12-09-2023, 12:56 PM	#4
bsn Drives: 2013 ZL1 Join Date: Sep 2021 Location: Virginia Posts: 302	I am not aware of anyone making a ready to go cutout for a ZL1 convertible due to the extra bracing. Any good welder can make something that will work. I am in the middle of fabricating some for my for my ZL1 convertible, I went with mechanical boost operated valves that open at 2lbs of boost with metal tubing getting pressure using the map sensor with a DMS adapter. I also have the tubing for the cutout pointed to the front at a 40 degree angle so when the valve is closed during normal cruising you don't have reversion as you get with anything at a 90 degrees or less facing rearward. You can also use electric valves instead of mechanical but they don't tend to be as reliable. Attached Images Last edited by bsn; 12-09-2023 at 01:08 PM.

12-10-2023, 09:22 AM	#8
SlowLS1 Drives: 2010 Camaro SS , 2011 Colorado LS1 Join Date: Jan 2022 Location: Greenville, SC Posts: 838	Hey bsn, where did you source that particular mechanical boost operated cutout? __________________

12-09-2023, 10:32 PM	#5
Little Walter Drives: ZL1 Join Date: Dec 2016 Location: New Orleans Posts: 261	Good noise maker, but no horsepower gain of any significance, maybe 2 horsepower at the most if that, but makes for some good loud sound.

12-09-2023, 11:49 PM	#6
Rob3D Drives: Car Join Date: Jan 2013 Location: Alabama Posts: 1,192	For what it’s worth, maybe skip the cutouts and install NOWEEDS. You’ll be much happier in the long run. And because they’re diverters they sound so much better than cutouts!

12-10-2023, 09:02 AM	#7
bsn Drives: 2013 ZL1 Join Date: Sep 2021 Location: Virginia Posts: 302	Its been proven on a blown car a cutout can add HP if the exhaust system is somewhat restrictive, on a N/A car there is little or no gain. With the valve closed they generally rob a few HP due to reversion, that is why I am trying a reverse Y it will act as an expansion chamber when closed and blow off excess back pressure when open. I am pretty sure I will pick up a measurable bit of HP open and not lose and maybe even pick up a minute amount of HP closed.

12-10-2023, 10:53 AM	#9
bsn Drives: 2013 ZL1 Join Date: Sep 2021 Location: Virginia Posts: 302	This is what I am using and have used in the past https://www.ebay.com/itm/234383713163 You can find them on Amazon or google it. No matter where you buy them, I think they are all coming from the same manufacturer. The quality is very good, if you're running much boost don't use a rubber line use a hard line like what is used on air suspension or metal 3/16" line. The nipples are 6mm so I am using 3/16 compression fittings with one side drilled out to 6mm-instead of the ferrell I am using a nitrile o ring. Can't pull it out by hand when tightened so should hold up fine under boost.

12-10-2023, 12:01 PM	#11
Mr V Drives: 2011 VR SS Vert Join Date: Aug 2015 Location: Minneapolis Posts: 372	Just from what I have read on the forums here, people seem to have a better opinion on the Noweeds vs QTP. More people complaining of failures with QTP. I was looking at using something like the BMR brace to see if that would allow Noweeds to work on a convertible. I may have to go the welding route if I decide to get them though. If anyone has a convertible with Noweeds would like to hear what they had to do. Attached Images Last edited by Mr V; 12-10-2023 at 12:07 PM. Reason: pic

12-10-2023, 04:04 PM	#13
spyderbuddy Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010 Location: Albany, Ga. Posts: 3,398 View My Garage	not much for me but i Got a Set of Headlight covers for the 2010 https://youtu.be/gSvfWD8MFxU __________________ PCP Hideaway Headlight Covers, BBK Headers & High Flow Cats, ZL1 Add-ons Wicker Bill, TL1/ZL1 Hood Insert, Gen5 DIY Frameless Mirror, ABL Dash Lighting an My link Navigation, Blacked out Rear Bowtie, all Sylvania led Turn Signals, Ceramic Window Tint By Nicks, MBRP Exhaust tips, GEN5 DIY Virginia Legal DRL Harness, Painted Brake Calipers, Vittesse Throttle Controller, Heritage Grill, Diode Dynamics Led Lighting, Manual Shifter Boot, Paddle Shifters, CNC Throttle Body, Trifecta Tune, RX Catch Can & Breather, Trunk Black out and Side Grills, Chevorlet door Sills.