ARH 1 3/4 or 1 7/8 cats or no cats?? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Q8Y · 10-27-2009, 05:58 PM

I've decided to order LTs for my camaro and I've settled on ARH.
1 3/4 or 1 7/8??cats or no cats??
wich one make more TQ /HP I did a search and no clear answer?
the plan is going to be LT's ,CAI and stage 1or 2 cam for now

P.s mine is LS3

Thanks

ChucksTuning · 10-27-2009, 06:03 PM

Get the 1 7/8 with cats... 1 3/4 is a good size to get if you plan on sticking with bolt ons, but the 1 7/8 will be better suited for future mods.

And cats will help keep the car smelling clean after you get a cam... no cats on a cammed car will usually cause a raw fuel smell at idle since larger cams don't efficiently burn all the fuel at idle.

SS-screamer · 10-27-2009, 07:32 PM

Is there a significant difference in sound b/t cats and no cats?

chappy48 · 10-27-2009, 07:33 PM

Go with where you want the power band to be. 1 3/4 gives you more torque throughout the entire rpm range and more hp down low. 1 7/8 will give you more hp up top. It's important to say you will gain tq and hp with either of these, it's just up to you where you want the most power. For just driving around the street I'd go with 1 3/4. If you are gonna track the car a lot and spend a lot of time in the upper rpm range go with 1 7/8.

_GTO_ · 10-28-2009, 07:31 AM

Simply if you want to get a cam get the 1 7/8 but if you stick with boltons have the 1 3/4 , either way the offroad pipes"catless" is the best .

Kelso · 10-28-2009, 08:08 PM

definetly catless is louder and makes around 10 hp

ZZcamaro · 10-28-2009, 08:11 PM

I would use the 1 7/8 system with cats. You will maintain reliability, sound great, make power, and you will have room to build more power with future mods.

Jekyll-N-Hyde · 10-29-2009, 06:04 AM

If im not mistaking a System from ARH comes with this piece for a Catted System am I correct ?

The offroad system does is consist of the same stuff just a different piece of pipe meaning one with the same bends just no cats ?
OR does it come with a totally different set piece of pipe with no cats and a different Xpipe ?

ZZcamaro · 10-29-2009, 08:08 AM

I believe it come with teh same pipes but no cats...
Thos epipes are bent that way for clearance, so I do not think that would change.

GQ4Life · 10-29-2009, 11:02 AM

if ur state does emission check u need cats..
if not then dont get cats save the money...

Jekyll-N-Hyde · 10-29-2009, 11:11 AM

GQ I have the 1 7/8 ARH system currently with Cat im going to purchase the offroad connection pipes and install those and when its time to get it inspected put the Cats on.

Surely it cant be hard to switch them out.

GQ4Life · 10-29-2009, 11:24 AM

no not hard at all to switch them out.. sounds good..

where i was in TX.. killeen there was no emission check

A.R. Headers · 10-29-2009, 12:17 PM

Guys, If your Camaro is LS3 powered, 1-7/8" is where you need to be. We've done the back to back testing (same day, same car, same dyno) and the LS3 wants 1-7/8" headers. After 2 hours on the dyno we could not get the 1-3/4" headers within 10 RWHP of the 1-7/8". These results do not apply to L99 equipped Camaro's.

Nick

lrc250 · 10-29-2009, 01:00 PM

Quote:

Originally Posted by A.R. Headers

Guys, If your Camaro is LS3 powered, 1-7/8" is where you need to be. We've done the back to back testing (same day, same car, same dyno) and the LS3 wants 1-7/8" headers. After 2 hours on the dyno we could not get the 1-3/4" headers within 10 RWHP of the 1-7/8". These results do not apply to L99 equipped Camaro's.

Nick

That is the kind of information that we wanted to hear, thanks!

10-27-2009, 05:58 PM	#1
Q8Y Drives: '12 F150 Join Date: Jun 2009 Location: KWT Posts: 132 View My Garage	ARH 1 3/4 or 1 7/8 cats or no cats?? I've decided to order LTs for my camaro and I've settled on ARH. 1 3/4 or 1 7/8??cats or no cats?? wich one make more TQ /HP I did a search and no clear answer? the plan is going to be LT's ,CAI and stage 1or 2 cam for now P.s mine is LS3 Thanks __________________ recieved 7-10-09 2010 camaro black 2ss/RS/6m

10-28-2009, 07:31 AM	#5
_GTO_ Drives: holden commodore Join Date: Jul 2008 Location: Saudi Arabia Posts: 128	Simply if you want to get a cam get the 1 7/8 but if you stick with boltons have the 1 3/4 , either way the offroad pipes"catless" is the best . __________________

10-28-2009, 08:08 PM	#6
Kelso Drives: 99 camaro Join Date: Sep 2009 Location: Tivoli, Tx Posts: 223	definetly catless is louder and makes around 10 hp __________________ Soon to own: 1SS CGM M6

10-29-2009, 11:02 AM	#10
GQ4Life Drives: 2010 Camaro SS LS3 Join Date: Aug 2009 Location: Fishkill, NY Posts: 5,211 View My Garage	if ur state does emission check u need cats.. if not then dont get cats save the money... __________________ 2015 Corvette Z06.. Lime Rock Park 1:01; Watkins Glen 2:14; Thompson Speedway 1:21

10-29-2009, 11:24 AM	#12
GQ4Life Drives: 2010 Camaro SS LS3 Join Date: Aug 2009 Location: Fishkill, NY Posts: 5,211 View My Garage	no not hard at all to switch them out.. sounds good.. where i was in TX.. killeen there was no emission check __________________ 2015 Corvette Z06.. Lime Rock Park 1:01; Watkins Glen 2:14; Thompson Speedway 1:21

10-27-2009, 06:03 PM	#2
ChucksTuning Drives: 05 Cadillac CTSV, 97 Camaro SS Join Date: Jun 2009 Location: Houston, TX Posts: 74	Get the 1 7/8 with cats... 1 3/4 is a good size to get if you plan on sticking with bolt ons, but the 1 7/8 will be better suited for future mods. And cats will help keep the car smelling clean after you get a cam... no cats on a cammed car will usually cause a raw fuel smell at idle since larger cams don't efficiently burn all the fuel at idle.

10-27-2009, 07:32 PM	#3
SS-screamer Drives: SIM RS/SS L99 Join Date: Sep 2009 Location: Sunshine State Posts: 207	Is there a significant difference in sound b/t cats and no cats?

10-27-2009, 07:33 PM	#4
chappy48 Drives: 2010 Camaro Auto 2SS/RS Join Date: Oct 2008 Location: Wauconda, IL Posts: 878	Go with where you want the power band to be. 1 3/4 gives you more torque throughout the entire rpm range and more hp down low. 1 7/8 will give you more hp up top. It's important to say you will gain tq and hp with either of these, it's just up to you where you want the most power. For just driving around the street I'd go with 1 3/4. If you are gonna track the car a lot and spend a lot of time in the upper rpm range go with 1 7/8.

10-28-2009, 08:11 PM	#7
ZZcamaro Drives: 2SS w/ ZZ427 Package!! Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,700	I would use the 1 7/8 system with cats. You will maintain reliability, sound great, make power, and you will have room to build more power with future mods.

10-29-2009, 06:04 AM	#8
Jekyll-N-Hyde I put the FU back in FUN Drives: 1969 SS 396 , 2010 Camaro SS Join Date: Jun 2009 Location: Between Weatherford and Azle TX hway730 Posts: 2,129	If im not mistaking a System from ARH comes with this piece for a Catted System am I correct ? The offroad system does is consist of the same stuff just a different piece of pipe meaning one with the same bends just no cats ? OR does it come with a totally different set piece of pipe with no cats and a different Xpipe ?

10-29-2009, 08:08 AM	#9
ZZcamaro Drives: 2SS w/ ZZ427 Package!! Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,700	I believe it come with teh same pipes but no cats... Thos epipes are bent that way for clearance, so I do not think that would change.

10-29-2009, 11:11 AM	#11
Jekyll-N-Hyde I put the FU back in FUN Drives: 1969 SS 396 , 2010 Camaro SS Join Date: Jun 2009 Location: Between Weatherford and Azle TX hway730 Posts: 2,129	GQ I have the 1 7/8 ARH system currently with Cat im going to purchase the offroad connection pipes and install those and when its time to get it inspected put the Cats on. Surely it cant be hard to switch them out.

10-29-2009, 12:17 PM	#13
A.R. Headers Drives: Pontiac G8 GT Join Date: May 2009 Location: new york Posts: 263	Guys, If your Camaro is LS3 powered, 1-7/8" is where you need to be. We've done the back to back testing (same day, same car, same dyno) and the LS3 wants 1-7/8" headers. After 2 hours on the dyno we could not get the 1-3/4" headers within 10 RWHP of the 1-7/8". These results do not apply to L99 equipped Camaro's. Nick

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