How much horsepower am i going to lose? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

73duster · 01-28-2014, 07:19 PM

I just dropped off my 2010 Camaro at a shop in order to swap out my current flowmaster cat back, for a Corsa catback. I just realized that the Flowmaster cat back is 3", while the Corsa is 2.5".

My car currently puts down 420 HP to the rear wheels with longtube headers, cam and tune. Am I going to lose a noticeable amount of power?

mydreamcar · 01-28-2014, 07:22 PM

Exhausts are usually for sound, if you lose anything it would be minimal at best

Denis · 01-28-2014, 07:47 PM

Zero.

Dyno shows that cat backs don't do jack for these cars aside from sound.

Juiced1 · 01-28-2014, 07:49 PM

You might actually gain some power. Corsa systems are straight through and generally outflow Flowmaster exhaust system.

73duster · 01-28-2014, 07:50 PM

I thought going from 3" to 2.5" would hurt performance.

nyrfan · 01-28-2014, 07:52 PM

You will lose nothing.

Sent from my AGM, 2SS/RS

14pilot · 01-28-2014, 08:10 PM

+1,000,000 you will not lose any power.

Explit Player · 01-28-2014, 08:13 PM

Well, you might loose like 1/2 of a hp if any. But probably not because Corsa is alot better at the systems they make vs Flowmasters.

usafboy · 01-28-2014, 08:57 PM

good news is your car will sound 1000 times better than flowmaster

jgray1978 · 01-29-2014, 06:11 AM

Quote:

Originally Posted by 73duster

I thought going from 3" to 2.5" would hurt performance.

I think that this would only be a factor if you were FI.

Apex Motorsports · 01-29-2014, 06:52 AM

Unless you are talking about forced induction, cat backs have very little impact on the dyno on these cars. Also the Corsa is much less restrictive than the Flowmaster muffler design so it would probably be a wash anyways. I would only expect a change in sound.

Schluney · 01-29-2014, 07:25 AM

2.5 corsa will support a lot of horsepower/flow the restriction on these cars is the exhaust manifolds/down pipes with cats

ssmike · 01-29-2014, 07:28 AM

to all of the above! Go for it!

axis · 01-29-2014, 11:47 AM

Quote:

Originally Posted by 73duster

I thought going from 3" to 2.5" would hurt performance.

That would be true if you were utilizing the extra girth of the exhaust. Fact is, 2.5in is MORE than enough to support mild to moderately modded LS3's. One you start moving some serious air, moving to 3in will start to shine.

01-28-2014, 07:19 PM	#1
73duster Drives: 2010 camaro ss automatic Join Date: May 2010 Location: bronx, N.Y. Posts: 182	How much horsepower am i going to lose? I just dropped off my 2010 Camaro at a shop in order to swap out my current flowmaster cat back, for a Corsa catback. I just realized that the Flowmaster cat back is 3", while the Corsa is 2.5". My car currently puts down 420 HP to the rear wheels with longtube headers, cam and tune. Am I going to lose a noticeable amount of power?

01-28-2014, 07:22 PM	#2
mydreamcar My Dream Car Drives: 2011 SIM LS3 1SS Join Date: Jul 2009 Location: staten island Posts: 1,534	Exhausts are usually for sound, if you lose anything it would be minimal at best __________________ CAI intake/ADM Scoop/Stainless Power Headers/Dynatech cat back exhaust/Vitesse Throttle Control/ Ported Throttle Body/QTP Electric Cutouts/ 3.91 gears and janetty rear posi/ Tuned by Janetty racing

01-28-2014, 07:47 PM	#3
Denis Drives: 2010 SS Join Date: May 2012 Location: Yorktown Heights, NY Posts: 7,695 View My Garage	Zero. Dyno shows that cat backs don't do jack for these cars aside from sound. __________________

01-28-2014, 07:52 PM	#6
nyrfan Let's go Rangers! Drives: 13' AGM 2SS/RS L99 Join Date: Jun 2011 Location: Orlando, FL Posts: 10,742 View My Garage	How much horsepower am i going to lose? You will lose nothing. Sent from my AGM, 2SS/RS __________________ Soprano 4/1/00-6/14/11, Gone but NEVER forgotten! FSP tuned: 377/389

01-28-2014, 08:13 PM	#8
Explit Player IG @Brian_ _Self Drives: 2010 Camaro 2SS M6+17'Tesla Model S Join Date: Nov 2012 Location: Bristol, TN : Instagram @Brian_ _Self Posts: 804 View My Garage	Well, you might loose like 1/2 of a hp if any. But probably not because Corsa is alot better at the systems they make vs Flowmasters. __________________

01-28-2014, 07:49 PM	#4
Juiced1 Account Suspended Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011 Location: St. Charles, IL Posts: 18,663	You might actually gain some power. Corsa systems are straight through and generally outflow Flowmaster exhaust system.

01-28-2014, 07:50 PM	#5
73duster Drives: 2010 camaro ss automatic Join Date: May 2010 Location: bronx, N.Y. Posts: 182	I thought going from 3" to 2.5" would hurt performance.

01-28-2014, 08:57 PM	#9
usafboy Drives: 2010 Silver SS/RS LS3 Join Date: Nov 2011 Location: Colorado Springs, CO Posts: 882	good news is your car will sound 1000 times better than flowmaster __________________ 2010 Silver Ice Metallic Camaro SS/RS LS3 Mods...so far: resonator/muffler delete, tinted everything, '13 shift knob/boot, bowtie delete, PFADT sway bars, CAI intake, Hurst short shifter, JBA cat deletes, BMR trailing arms/outer bushings/steering rack bushing, Bo White ported TB. Rhino79 Dyno tuned...405 HP/399 TQ

01-29-2014, 06:52 AM	#11
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	Unless you are talking about forced induction, cat backs have very little impact on the dyno on these cars. Also the Corsa is much less restrictive than the Flowmaster muffler design so it would probably be a wash anyways. I would only expect a change in sound.

01-29-2014, 07:25 AM	#12
Schluney Drives: 2014 2SS 1LE Join Date: Sep 2013 Location: Twin Cities Posts: 621	2.5 corsa will support a lot of horsepower/flow the restriction on these cars is the exhaust manifolds/down pipes with cats __________________ 14 2SS RS 1LE Recaro NPP Pat G cam and tune, Trick flow heads Long tube headers catless

01-29-2014, 07:28 AM	#13
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,840	to all of the above! Go for it!