Headers+hi flo cats+oem cat back system? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

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 Motorsports · 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.

xxlbeerz · 11-20-2010, 10:50 AM

Has anyone done a dyno with this set up before, and then put on a 3" cat back to see how much low end torque is lost? Or at least butt-o-meter results?

redsap05 · 11-20-2010, 11:23 AM

I would really like to see some more of you people cam your car with the stock catback on it. One person has and it picked up trq. Its my belief that the ls3 when cammed likes the additional backpressure. One forum member gained power and trq by going back to the stock catback on his cam setup.

BlaSSt Off · 11-20-2010, 12:05 PM

Here is mine with Kooks 1 7/8" and highflow cats and muffler delete.

And here I am playing at the local cruise night.

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: 2,336	__________________ 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 Mickey Thompson @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: 2,336	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 Mickey Thompson @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: 1,469	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: 1,119 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.

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11-19-2010, 09:33 PM	#15
MarylandSpeed Account Suspended Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 3,378	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, 10:25 PM	#22
xxlbeerz Drives: 2010 Black on Black Join Date: Oct 2010 Location: Houston, TX Posts: 533	...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 Drives: '15 Z06, '01 NBM SS, '97 SS Join Date: May 2009 Location: Rio Rancho, NM Posts: 12,170	We have some videos of LT's on Stock Catback LS3 cars..... http://www.youtube.com/user/SouthwestSpeedLLC Dig it! Ivan

11-20-2010, 05:06 AM	#25
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	LTs with high flow cats and the stock mufflers sounds pretty good, especially if you want some rumble without it being too loud.

11-20-2010, 10:50 AM	#26
xxlbeerz Drives: 2010 Black on Black Join Date: Oct 2010 Location: Houston, TX Posts: 533	Has anyone done a dyno with this set up before, and then put on a 3" cat back to see how much low end torque is lost? Or at least butt-o-meter results?

11-20-2010, 11:23 AM	#27
redsap05 Drives: 2005 pontiac gto Join Date: Jul 2008 Location: akron oh Posts: 174	I would really like to see some more of you people cam your car with the stock catback on it. One person has and it picked up trq. Its my belief that the ls3 when cammed likes the additional backpressure. One forum member gained power and trq by going back to the stock catback on his cam setup.