want to fabricate a stainless works exhuast system to dual mode - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

lionssfan · 04-08-2014, 10:40 PM

Yea guys, Looking for some input, anybody know if its possible to make a retro chambered stainless works exharst system into a dual mode by fabricating? Possibly purchase a gm dual mode butter flies and npp controll box from gm warehouse. Any other ideas appreciated. Love the retro chamber sound just would like to tone it down when needed. thanks

Apex Motorsports · 04-09-2014, 06:47 AM

Is it possible? Sure. You couldn't just put the valves directly on the Retro Chambered though. You would have to get the Retro Chambered cat back and a set of NPP dual mode mufflers and install them on the rear of the cat back to get it to work.

SomeGeoffGuy · 04-09-2014, 07:31 AM

I didn't think they sold just the valve. If you find a way to get it, let us all know!

-Geoff

ST1LE · 04-09-2014, 07:45 AM

This will cost you well over $2000 for parts alone!! I like where your head is at though.

lionssfan · 04-09-2014, 07:59 AM

Quote:

Originally Posted by Apex Chase

Is it possible? Sure. You couldn't just put the valves directly on the Retro Chambered though. You would have to get the Retro Chambered cat back and a set of NPP dual mode mufflers and install them on the rear of the cat back to get it to work.

so run the retro chambered pipes thru the npp dual mode mufflers? Your saying cutting open the npp dual mode mufflers if I understand and fabricating the retro chambered pipes to run inside the muffler right? I did call SW if they had any future plans for a dual mode setup and they said no at this time...darn it.

lionssfan · 04-09-2014, 08:03 AM

Quote:

Originally Posted by ST1LE

This will cost you well over $2000 for parts alone!! I like where your head is at though.

yea not cheap. I do metal fabricating for a living so that will help some on the cost.

ST1LE · 04-09-2014, 08:07 AM

Quote:

Originally Posted by lionssfan

yea not cheap. I do metal fabricating for a living so that will help some on the cost.

Thats awesome! I am excited to see what the end result is. One word of advise(you prob know) is look on the classifieds. Seems there is always a NPP for sale in the ZL1 section and I have seen a couple retros too, but thats NOT common.

Apex Motorsports · 04-09-2014, 08:13 AM

Quote:

Originally Posted by lionssfan

so run the retro chambered pipes thru the npp dual mode mufflers? Your saying cutting open the npp dual mode mufflers if I understand and fabricating the retro chambered pipes to run inside the muffler right? I did call SW if they had any future plans for a dual mode setup and they said no at this time...darn it.

The chambered sections of the Retro Chambered are up under the car where you would normally expect resonators to be. I would just hack of the back of the SW system and attach the NPP mufflers like an axle back.

lionssfan · 04-09-2014, 08:36 AM

Quote:

Originally Posted by Apex Chase

The chambered sections of the Retro Chambered are up under the car where you would normally expect resonators to be. I would just hack of the back of the SW system and attach the NPP mufflers like an axle back.

Gotcha you now Apex. So you think the "sound" of the SW retro chamber exhaust sys should sound the same even though it's going thru the npp mufflers? If you know thanks Apex

Apex Motorsports · 04-09-2014, 08:51 AM

Quote:

Originally Posted by lionssfan

Gotcha you now Apex. So you think the "sound" of the SW retro chamber exhaust sys should sound the same even though it's going thru the npp mufflers? If you know thanks Apex

When the valves are open the NPP is straight through so under those conditions it would be the same. When they were closed it should be more subdued but still have the deep tone and growl.

Three of Swords · 04-09-2014, 11:47 AM

Just a reminder: There are two sets of chambers on each pipe. One it located in the 'resonator spot' (as Chase says), but another is in the 'muffler spot'. If you install as Chase says, you'll lose one of those chambers.

I'm not sure how much it will change your sound by eliminating one. You might be able to add it upstream though.

Note: I just installed a retro-chambered catback yesterday. It sounds awesome. I understand the desire to keep the sound!

04-08-2014, 10:40 PM	#1
lionssfan Drives: 2010 2ss camaro Join Date: Nov 2010 Location: mi Posts: 1,184 View My Garage	want to fabricate a stainless works exhuast system to dual mode Yea guys, Looking for some input, anybody know if its possible to make a retro chambered stainless works exharst system into a dual mode by fabricating? Possibly purchase a gm dual mode butter flies and npp controll box from gm warehouse. Any other ideas appreciated. Love the retro chamber sound just would like to tone it down when needed. thanks

04-09-2014, 07:31 AM	#3
SomeGeoffGuy Drives: 2023 2SS Convertible Join Date: May 2009 Location: Metro Detroit Posts: 1,062	I didn't think they sold just the valve. If you find a way to get it, let us all know! -Geoff __________________ '12 2SS RS Convertible - Traded in. '16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange.

04-09-2014, 07:45 AM	#4
ST1LE Drives: E92 BMW M3 Join Date: Oct 2012 Location: Houston Posts: 4,496	This will cost you well over $2000 for parts alone!! I like where your head is at though. __________________ SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs. J-Rod Built and Matt@FSP Tuned

04-09-2014, 11:47 AM	#11
Three of Swords Drives: 2011 IBM 1SS/RS L99 Join Date: Mar 2011 Location: MI Posts: 300	Just a reminder: There are two sets of chambers on each pipe. One it located in the 'resonator spot' (as Chase says), but another is in the 'muffler spot'. If you install as Chase says, you'll lose one of those chambers. I'm not sure how much it will change your sound by eliminating one. You might be able to add it upstream though. Note: I just installed a retro-chambered catback yesterday. It sounds awesome. I understand the desire to keep the sound! __________________

04-09-2014, 06:47 AM	#2
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	Is it possible? Sure. You couldn't just put the valves directly on the Retro Chambered though. You would have to get the Retro Chambered cat back and a set of NPP dual mode mufflers and install them on the rear of the cat back to get it to work.