Headers+hi flo cats+oem cat back system? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Outlaw77 · 11-18-2010, 04:02 PM

I've been looking around on the exhaust sticky and I was wondering if anyone is running 1 7/8 headers w/ hi flow cats with the oem cat back system. With or without the stock mufflers . How does it sound and what are your impressions? I don't want to buy an aftermarket cb system if there are no gains in performance. From what I see the stock system is fine for what I need. I would consider different mufflers, I really like the way flowmasters sound with headers.

FEN · 11-18-2010, 04:47 PM

I will be running 1 7/8" headers and Hi-Flo cats with the factory cat back in the near future. Idle and cruise sounds just a little louder but at WOT it sounds great IMHO. I was told by several shops that this would support a Maggie and that swapping it out w/aftermarket cat back would offer little or no HP gain. Search Youtube for "2010 Camaro headers with stock exhaust" and you should find a few vids.

JDP Tyler · 11-18-2010, 04:51 PM

We've done similar setups to what you're looking for Outlaw. Give us a call if you have any questions.

Sincerely,

Rick

mikeSS · 11-18-2010, 05:22 PM

Quote:

Originally Posted by FEN

I will be running 1 7/8" headers and Hi-Flo cats with the factory cat back in the near future. Idle and cruise sounds just a little louder but at WOT it sounds great IMHO. I was told by several shops that this would support a Maggie and that swapping it out w/aftermarket cat back would offer little or no HP gain. Search Youtube for "2010 Camaro headers with stock exhaust" and you should find a few vids.

ya it does sound good with stock cat back, its just the car sound great but the muffler look very ugly hanging down like that

Darth_Emma · 11-18-2010, 05:24 PM

Like mikeSS said, I couldn't stand the look of the mufflers (garbage cans) handing down in the back. UGLY! They had to go.

Outlaw77 · 11-18-2010, 05:25 PM

Quote:

Originally Posted by mikeSS

ya it does sound good with stock cat back, its just the car sound great but the muffler look very ugly hanging down like that

Yea, thats the reason why I'm considering different mufflers and just getting an idea of what sounds good. If the stockies weren't so ugly I woudn't care but dam! I hate have too many choices! lol

FEN · 11-18-2010, 05:32 PM

A Few links....
LT's w/factory cat back

LT's w/factory cat back cammed

My factory GFX kit seems to help hide them a bit. The pic below was taken at a very low angle. Standing behind the car they are almost not noticeable.

Outlaw77 · 11-18-2010, 06:40 PM

thanks for the links!

xxlbeerz · 11-18-2010, 07:31 PM

I'd get headers that include an X-pipe.

1Camaro2SS · 11-19-2010, 07:23 AM

I agree that the stock mufflers are nasty looking. As far as horsepower goes, you would gain few ponies with an X-Pipe but not the mufflers. Mufflers are mostly for sound and looks.

Outlaw77 · 11-19-2010, 11:07 AM

Quote:

Originally Posted by john468

Check this guy out $850 for full exhaust
http://www.camaro5.com/forums/showthread.php?t=113481

thanks for the link but I need a header system with hi flow cats included. Great price though.

xxlbeerz · 11-19-2010, 11:23 AM

Quote:

Originally Posted by Outlaw77

thanks for the link but I need a header system with hi flow cats included. Great price though.

Same boat as me. I think they'd sell way better if cats were offered.

ITGuy11 · 11-19-2010, 01:47 PM

Kooks headers w/high-flow cats from marylandspeed.

bigsquirrel · 11-19-2010, 01:49 PM

My brother runs american racing headers and cats on stock catback. Sounds pretty mean.

MarylandSpeed · 11-19-2010, 09:33 PM

I have run Kooks, and with the stock catback, they are not offensive, however I also would not describe the soudn as "great".

jsharp · 11-19-2010, 09:51 PM

jsharp · 11-19-2010, 09:53 PM

The first part is with Kooks 1-7/8 and catted connection pipes with all stock exhaust and muffler. Then the diverters open OMG!

Hicompression · 11-19-2010, 10:10 PM

I'm running OBX longtube headers with cat delete midpipes and the stock cat-back on a LS3. The sound is great!

ParisTNDude · 11-19-2010, 10:11 PM

Quote:

Originally Posted by Outlaw77

I've been looking around on the exhaust sticky and I was wondering if anyone is running 1 7/8 headers w/ hi flow cats with the oem cat back system. With or without the stock mufflers . How does it sound and what are your impressions? I don't want to buy an aftermarket cb system if there are no gains in performance. From what I see the stock system is fine for what I need. I would consider different mufflers, I really like the way flowmasters sound with headers.

I have exactly what you mention here but with an Edelbrock X Pipe and I think it sounds ok. If there's any criticism, I think it sounds too raspy. I am thinking of putting the Flowmaster Hushpower axle back on it, but don't know if that would mellow the sound out or not. I haven't heard a sound clip with exactly my mods.

alfie43 · 11-19-2010, 10:12 PM

How a car sounds is a very subjective call. What may sound great to you may sound #%^&* to someone else. There seems to an age factor in all of this also. Younger drivers just want LOUD. I understand that; years ago, I drove around on the street with open headers. Older guys tend to reject the "louder the better" approach and put more emphasis on the tone and quality of the sound in addition to volume.

With that said, I have 1-7/8" Kooks LTs, high-flow cats and a stock exhaust system. I personally feel it the best balance between loud on WOT and quiet at freeway cruise with none of the dreaded drone. My car has a Maggie S/C and it sounds awesome on WOT.

As others have already said, it is a proven fact that there is very little, if any, power gains to be had after the cats...only sound changes.

Alfie

FEN · 11-19-2010, 10:22 PM

Quote:

Originally Posted by alfie43

How a car sounds is a very subjective call. What may sound great to you may sound #%^&* to someone else. There seems to an age factor in all of this also. Younger drivers just want LOUD, (years ago, I drove with open headers on the street) while older guys tend to reject the "louder the better" approach and put an emphasis on the tone and quality of the sound in addition to volume.

With that said, I have 1-7/8" Kooks LTs, high-flow cats and a stock exhaust system. I personally feel it the best balance between loud on WOT and quiet at freeway cruise with none of the dreaded drone. My car has a Maggie S/C and it sounds awesome on WOT.

As others have already said, it is a proven fact that there is very little, if any, power gains to be had after the cats...only sound changes.

Alfie

xxlbeerz · 11-19-2010, 10:25 PM

...and the Jeanetty test showed that there was no difference really between high flow cats and off-road pipes.

alfie43 · 11-19-2010, 10:33 PM

Quote:

Originally Posted by xxlbeerz

...and the Jeanetty test showed that there was no difference really between high flow cats and off-road pipes.

Yup!

Ivan @ Southwest Speed · 11-19-2010, 11:29 PM

We have some videos of LT's on Stock Catback LS3 cars.....

http://www.youtube.com/user/SouthwestSpeedLLC

Dig it!
Ivan

Apex Chase · 11-20-2010, 05:06 AM

LTs with high flow cats and the stock mufflers sounds pretty good, especially if you want some rumble without it being too loud.

11-18-2010, 04:02 PM	#1
Outlaw77 Drives: 2010 2SS/RS I.O.M. Camaro 6MT Join Date: Aug 2010 Location: Calgary AB, Canada Posts: 781	Headers+hi flo cats+oem cat back system? I've been looking around on the exhaust sticky and I was wondering if anyone is running 1 7/8 headers w/ hi flow cats with the oem cat back system. With or without the stock mufflers . How does it sound and what are your impressions? I don't want to buy an aftermarket cb system if there are no gains in performance. From what I see the stock system is fine for what I need. I would consider different mufflers, I really like the way flowmasters sound with headers.

11-18-2010, 04:47 PM	#2
FEN Drives: BLACK 2SS/RS Join Date: Sep 2009 Location: Florida Posts: 1,091	I will be running 1 7/8" headers and Hi-Flo cats with the factory cat back in the near future. Idle and cruise sounds just a little louder but at WOT it sounds great IMHO. I was told by several shops that this would support a Maggie and that swapping it out w/aftermarket cat back would offer little or no HP gain. Search Youtube for "2010 Camaro headers with stock exhaust" and you should find a few vids. __________________ CCW polished 505a's Front 20x10 w/275/40/20's Rear 20x11.5 w/305/35/20's Eibach 1" Pro Spring Kit Factory GFX MPD1 spoiler painted bowties 15% tint

11-18-2010, 04:51 PM	#3
JDP Tyler Drives: 2010 Camaro SS/RS Join Date: Nov 2010 Location: SLC, UT Posts: 5,370	We've done similar setups to what you're looking for Outlaw. Give us a call if you have any questions. Sincerely, Rick __________________

11-18-2010, 05:24 PM	#5
Darth_Emma Psssssssssshhhhhhhhhhhhh! Drives: under contruction Join Date: Nov 2009 Location: Marysville, Ohio Posts: 13,151 View My Garage	Like mikeSS said, I couldn't stand the look of the mufflers (garbage cans) handing down in the back. UGLY! They had to go. __________________

11-19-2010, 07:23 AM	#10
1Camaro2SS Drives: 2010 2SS/RS L99 Join Date: Sep 2010 Location: McHenry, Illinois Posts: 1,425 View My Garage	I agree that the stock mufflers are nasty looking. As far as horsepower goes, you would gain few ponies with an X-Pipe but not the mufflers. Mufflers are mostly for sound and looks. __________________ 432 RWHP 391 RWTQ 12.37 1/4 mile on stock tires

11-18-2010, 06:40 PM	#8
Outlaw77 Drives: 2010 2SS/RS I.O.M. Camaro 6MT Join Date: Aug 2010 Location: Calgary AB, Canada Posts: 781	thanks for the links!

11-18-2010, 07:31 PM	#9
xxlbeerz Drives: 2010 Black on Black Join Date: Oct 2010 Location: Houston, TX Posts: 535	I'd get headers that include an X-pipe.

11-19-2010, 01:47 PM	#13
ITGuy11 Burning up tires Drives: 2010 Camaro 1SS/RS Join Date: Jul 2010 Location: Macomb Twp, MI Posts: 703	Kooks headers w/high-flow cats from marylandspeed. __________________ Blower, cam, supporting mods 644RWHP 615RWTQ My Build Thread COTW 11/19/12 Detroit 5th Gen Camaro Club

11-19-2010, 01:49 PM	#14
bigsquirrel My car runs on acorns.... Drives: 2010 SS RS Inferno Orange Join Date: Feb 2010 Location: Albuquerque Posts: 1,343 View My Garage	My brother runs american racing headers and cats on stock catback. Sounds pretty mean.

11-19-2010, 09:33 PM	#15
MarylandSpeed Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 2,504	I have run Kooks, and with the stock catback, they are not offensive, however I also would not describe the soudn as "great".

11-19-2010, 09:51 PM	#16
jsharp NOW CAMMED & SUPERCHARGED Drives: 2010 Camaro 2SS/RS Black w/ IOM Join Date: Oct 2008 Location: Ar Posts: 2,328	__________________ Livernois Motorsports: Maggie 2300 7psi, Livernois 2C cam/L99 to LS3 Conversion, Ported TB, Rotofab w/adm race scoop, adm trans cooler,Kooks headers no cats, Kooks 3" exhaust. METCO breather. Precision 2400 Vigilante TC. Eibach Lowering Springs & Swaybars. BMR Trailing arms, BMR Rear Cradle Bushings, BMR Toe Rods, BMR Differential bushings. Vossen CV3 20's w/ 305 Nitto 555R@25psi. Zl1 front bumper. OE Zl1 Hood and matte black insert. 556RWHP/500RWTQ L99

11-19-2010, 09:53 PM	#17
jsharp NOW CAMMED & SUPERCHARGED Drives: 2010 Camaro 2SS/RS Black w/ IOM Join Date: Oct 2008 Location: Ar Posts: 2,328	The first part is with Kooks 1-7/8 and catted connection pipes with all stock exhaust and muffler. Then the diverters open OMG! __________________ Livernois Motorsports: Maggie 2300 7psi, Livernois 2C cam/L99 to LS3 Conversion, Ported TB, Rotofab w/adm race scoop, adm trans cooler,Kooks headers no cats, Kooks 3" exhaust. METCO breather. Precision 2400 Vigilante TC. Eibach Lowering Springs & Swaybars. BMR Trailing arms, BMR Rear Cradle Bushings, BMR Toe Rods, BMR Differential bushings. Vossen CV3 20's w/ 305 Nitto 555R@25psi. Zl1 front bumper. OE Zl1 Hood and matte black insert. 556RWHP/500RWTQ L99

11-19-2010, 10:10 PM	#18
Hicompression Rumbly Bumble Bee Drives: 2010 2SS Camaro Join Date: Aug 2009 Location: DFW Posts: 1,462	I'm running OBX longtube headers with cat delete midpipes and the stock cat-back on a LS3. The sound is great! __________________ 2010 RALLY YELLOW 2SS 6M -OBX Longtubes FTW!

11-19-2010, 10:12 PM	#20
alfie43 Drives: S/C 2SS/RS Camaro-6M-VicRed Join Date: Aug 2009 Location: Alfie (Mariano) lives in Shelby Twp, Metro-Detroit Posts: 1,118 View My Garage	How a car sounds is a very subjective call. What may sound great to you may sound #%^&* to someone else. There seems to an age factor in all of this also. Younger drivers just want LOUD. I understand that; years ago, I drove around on the street with open headers. Older guys tend to reject the "louder the better" approach and put more emphasis on the tone and quality of the sound in addition to volume. With that said, I have 1-7/8" Kooks LTs, high-flow cats and a stock exhaust system. I personally feel it the best balance between loud on WOT and quiet at freeway cruise with none of the dreaded drone. My car has a Maggie S/C and it sounds awesome on WOT. As others have already said, it is a proven fact that there is very little, if any, power gains to be had after the cats...only sound changes. Alfie __________________ Last edited by alfie43; 11-20-2010 at 12:36 PM.

11-19-2010, 10:25 PM	#22
xxlbeerz Drives: 2010 Black on Black Join Date: Oct 2010 Location: Houston, TX Posts: 535	...and the Jeanetty test showed that there was no difference really between high flow cats and off-road pipes.

11-19-2010, 11:29 PM	#24
Ivan @ Southwest Speed Southwestspeed.net Drives: '10 2SS/RS, '96 Z28 Join Date: May 2009 Location: Rio Rancho, NM Posts: 11,293	We have some videos of LT's on Stock Catback LS3 cars..... http://www.youtube.com/user/SouthwestSpeedLLC Dig it! Ivan __________________ The Sizzle Build / Follow us on Facebook!! / Aut ism Speaks / Instagram

11-20-2010, 05:06 AM	#25
Apex Chase Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 21,665	LTs with high flow cats and the stock mufflers sounds pretty good, especially if you want some rumble without it being too loud. __________________ 502.930.2739 \| Contact Apex By Email \| Check Out Our Facebook Page \|

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