$20 Exhaust Mod - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

bub · 07-17-2018, 10:32 PM

Playing around with this before buying a cat back for our project car.

Cut outs and turn downs....obviously also painted factory muffler cans to hide them a bit...

not sure why system keeps flipping this pic..

Frankly I was surprised that it sounds nearly as good as the NPP systems I have retrofitted to Gen 5's in the past.

Guessing flow is like 1/2 thru the muffler and 1/2 thru the cut out at idle and more thru cut-out as flow increases and back-pressure builds in front of muffler with throttle...

spyderbuddy · 07-18-2018, 11:33 AM

nice idea, i like
not if we just install the variable cut outs

acammer · 07-18-2018, 12:16 PM

That's essentially how I did mine. Before I was cammed I was perfectly content to keep them open all the time. Now it's louder than ever, and doesn't really like to be cruised under 2,000rpm, so it's SUPER loud. I'm going to order the valves from JEGs so I can have it tame when I want, and wild the rest of the time.

GONIF · 07-18-2018, 12:36 PM

That will wake the neighbors when you cruse on in at 2 in the morning .

Talladega · 07-18-2018, 08:51 PM

Quote:

Originally Posted by GONIF

That will wake the neighbors when you cruse on in at 2 in the morning .

Yep, that's the sole reason I put QTP cutouts on so I can mute it at 5:00 in the morning when I go to work.

InFiD3ViL · 07-18-2018, 09:16 PM

*BUB, any chance you can upload a sound clip? I am very curious how that sounds, as many of the homegrown ideas tend to turn out pretty damn good.

Quote:

Originally Posted by Talladega

Yep, that's the sole reason I put QTP cutouts on so I can mute it at 5:00 in the morning when I go to work.

I'm worried about this myself.

I have longtubes and Flowmaster Outlaws (which I freaking love), no cats. In 2 weeks I start my new shift, 6am-2:30pm. Which means I have to leave at 4:45am M-F.

The neighbors already give me the stink eye, so they are going to love this.

I would love to design a dual type exhaust system. What I mean by that is, use electric cutouts where one setting is my Outlaws and the other setting is a more refined and quiet muffler setup. Maybe some sort of Magnaflows that dump while leaving my Outlaws running out the back. Problem is the space under the car. I would have to use bullet style mufflers, which usually are not the quietest. But I am sure I could find something suitable.

acammer · 07-19-2018, 12:43 PM

Quote:

Originally Posted by InFiD3ViL

*BUB, any chance you can upload a sound clip? I am very curious how that sounds, as many of the homegrown ideas tend to turn out pretty damn good.

This what mine sounds like with cutouts in the back. Its honestly quite savagely loud. Perfect for fooling around. Not so great for creeping in late at night.

07-17-2018, 10:32 PM	#1
bub Drives: '17 1SS 1LE & '15 Corvette Z06 Join Date: May 2009 Location: Olathe, KS Posts: 669	$20 Exhaust Mod Playing around with this before buying a cat back for our project car. Cut outs and turn downs....obviously also painted factory muffler cans to hide them a bit... not sure why system keeps flipping this pic.. Frankly I was surprised that it sounds nearly as good as the NPP systems I have retrofitted to Gen 5's in the past. Guessing flow is like 1/2 thru the muffler and 1/2 thru the cut out at idle and more thru cut-out as flow increases and back-pressure builds in front of muffler with throttle... Last edited by bub; 07-18-2018 at 10:00 AM.

07-18-2018, 11:33 AM	#2
spyderbuddy Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010 Location: Albany, Ga. Posts: 3,399 View My Garage	nice idea, i like not if we just install the variable cut outs __________________ 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.

07-18-2018, 12:16 PM	#3
acammer GPI Sales Consultant Drives: 2011 Camaro 2SS SGM Join Date: Jul 2016 Location: Weedsport, NY Posts: 2,794 View My Garage	That's essentially how I did mine. Before I was cammed I was perfectly content to keep them open all the time. Now it's louder than ever, and doesn't really like to be cruised under 2,000rpm, so it's SUPER loud. I'm going to order the valves from JEGs so I can have it tame when I want, and wild the rest of the time. Attached Images __________________ GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph. *Got a question about a GPI product? Feel free to shoot me a message!*

07-18-2018, 12:36 PM	#4
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	That will wake the neighbors when you cruse on in at 2 in the morning . __________________ OLD GUY FLYING FAST AND LOW